Category Archives: CMT Tactical

These days everyone builds their own AR and for good reason…its a ton of fun, can save you money and gives you good knowledge of how an AR works. One issue that many AR builders run into is finding compatibility issues with the parts they bought. With the popularity of ultra low profile handguards one of the most common issues is gas block incompatibility. Many handguards are so low profile that they can actually come in contact with the gas block itself or accessories attached to the handguard. I recently ran into this issue myself and figured I would share my experience with you.

One of my most recent builds is a DMR style rifle with a BSF Barrels 16″ barrel with a Carbon Fiber Shroud. Because of the carbon fiber shroud (designed to strengthen the barrel, reduce weight and help it vent heat) the gas block seat is .936″ so of course I just ordered any old .936″ low pro gas block. 

Cross Machine Tool 936 low pro gas block on BSF Barrel AERO

Everything installed just fine, I slid the Cross Machine Tool UHPR Mod 2 handguard over the barrel, tightened it all down and … DUN DUN DUUUUN … the gas block was touching the bottom of the handguard. Not just close, literally touching. That’s called “unfreefloating” your barrel. 😂😂 This is something I verify every time I build a rifle as I’ve also seen MLOK screws touching gas blocks as well. Anything coming in contact with the gas block / barrel can and will effect accuracy even at just 100 yards.

Gas Block Touching CMT rail

In a basic beater build you might not care but in a build like this where accuracy is the goal, you have no other choice than to either swap out the gas block or swap out the handguard. Easiest and cheapest is to swap the gas block. Thankfully Cross Machine Tool has just released their new line of J.A.G. (Just A GasBlock) gas blocks which includes a .936 Gas Block specifically designed to fit under their UHPR handguards and many other super low profile handguards.

**One of the only things I actually do like about .936 gas block seats is that the .936″ opening of the gas block is usually big enough to remove without taking off the muzzle device**

936 gas block over dragon muzzle brake

New CMT Gas Block Installed on BSF Barrel Lantac Dragon CMC Trigger

While I had the gas block off I also decided to put a second dimple on the barrel so that the second set screw of the gas block would screw all the way in instead of sticking out just to make sure there was adequate clearance.

Dimpled Barrel for low pro gas block

At this point it was time to reinstall the CMT handguard and check to see how it fit. Flipped it over and definitely good to go! The new Cross Machine Tool JAG .936 Gas Block did the trick and my barrel is now truly Free Floating. 

Handguard not touching low pro gas block 1

Handguard free floating not touching low pro gas block 2

CMT 936 Gas Block Installed

Cross Machine Tool 936 Gas Block Free Float Low Pro Handguard BSF Barrels AERO CMC Lantac Vortex Optics

Only thing left to do now is get this blaster to the range. I’ll have a full review of the BSF Barrels 16″ barrel coming soon. If you’re looking for an affordable low profile gas block you can’t go wrong with the new Cross Machine Tool JAG Gas Blocks.

More and more it is becoming very apparent that Cross Machine Tool is more than just an AR receiver manufacturer. CMT was not satisfied with just making some amazing receiver sets so they basically starting making everything else. First it was muzzle devices, which they offer multiple models now. Then they came out with some extremely nice AR-15 and AR-10 handguards and most recently they announced they are introducing their new JAG gas blocks. Well, if you add all of those parts up you’re basically only a few parts away from a complete rifle so it only made sense for Cross Machine Tool to start offering complete rifles. 

Currently they are offering a number of different models including a 10.5″ 5.56 SBR, a 16″ 5.56 rifle and a 20″ 6.5 Creedmoor AR-10 rifle as shown below.

Cross Machine Tool 10.5″ 5.56 SBR

Cross Machine Tool 10.5 INCH SBR

Cross Machine Tool 16″ 5.56 Rifle

Cross Machine Tool 16 inch rifle

Cross Machine Tool 20″ 6.5 Creedmoor Rifle

Cross Machine Tool 20 inch 6.5 Creedmoor rifle

I can tell you I’ve built a ton of personal rifles using Cross Machine Tool receivers, handguards, etc. and you simply can’t go wrong with them. If you’re looking for a new factory built rifle or if you want to buy the individual components and build one your self, Cross Machine Tool is an option that is hard to beat. Check them out at www.CMTTAC.com.

Memorial Day Savings Starts NOW!!! USE COUPON CODE “REMEMBER” DURING CHECKOUT TO SAVE 10% ON ALL CMT AR15/10 PRODUCTS THROUGH MONDAY 5-29-17!!

www.CMTTAC.com

Cross Machine Tool MOD1 and 2sCross Machine Tool Z Brake 6Cross Machine Tool CRC556 1

 

Rainier Arms has the exclusive intro offering of the new Cross Machine Tool ZCOMP-L Linear Muzzle Device. The new ZCOMP-L is basically a blast forwarding device with a few small side ports as well as some cool machining. The machining on the outside gives it a similar look to the standard ZCOMP and the mag well grooves CMT is know for. With out outside diameter of just 1.187″ you should be able to tuck a portion of this comp under many rails for a nice clean look.

Cross Machine Tool ZCOMP L Linear comp 1

Cross Machine Tool ZCOMP L Linear comp 1

Cross Machine Tool’s ZCOMP™ LINEAR provides forward directional muzzle blast control desired on rifles with shorter barrels. The outer diameter fluting and front nose cuts not only reduce the overall weight of the device but also blend with the aggressive aesthetic appearance of our Trademark magwell grooves on CMT UHP15 series Lower receivers. Function of the ZCOMP LINEAR muzzle device is equaled by the exceptional visible manufacturing quality & apprearence you expect from Cross Machine Tool products. MADE IN USA.

Features for ZCOMP™ LINEAR 556:
– 1/2 28 RH ID threads
– 1.187″ max diameter x 2.75″ OAL.   Nitride finish
– Weight- 5.5 ozs.
– Caliber- 5.56mm / .223 Remington only
– Rating- Full Auto
– Zero porting on bottom side to reduce ground signature when fired from the prone position
– Zero porting on the center top side to reduce flash sight obstruction through optics/sights
– Minimal side port holes minimzing side blast concussion
– Crush washer included

Features for ZCOMP™ LINEAR .30 :
– 5/8- 24 RH ID threads
– 1.187″ max diameter x 2.75″ OAL.   Nitride finish
– Weight- 5.3 ozs.
– Caliber- 308, 300blkout, 6.5
– Rating- Full Auto
– Zero porting on bottom side to reduce ground signature when fired from the prone position
– Zero porting on the center top side to reduce flash sight obstruction through optics/sights
– Minimal side port holes minimzing side blast concussion
– Crush washer included

If you want to get your hands on the first batch of CMT ZCOMP-L’s to hit the market and get an exclusive intro price on them too, head on over to www.RainierArms.com now. They have both .22 Cal and .30 Cal models in stock and ready to ship.

Right on the heels of releasing their new MOD2 handguards, Cross Machine Tool is now introducing their new ZCOMP LINEAR muzzle device. The ZCOMP-L will be available in .22, .30 and 9mm models with a Black Nitride finish. It also features the new signature ZCOMP “Z” patterned fluting and porting. It is also full auto rated and a 1.187″ outside diameter meaning it will tuck under most rails out there. Check out the images below showing the ZCOMP-L from drawing to finished product.

Cross Machine Tool ZCOMP-L Linear Muzzle Device 1

Cross Machine Tool ZCOMP-L Linear Muzzle Device 1

Cross Machine Tool ZCOMP-L Linear Muzzle Device 1

Cross Machine Tool ZCOMP-L Linear Muzzle Device 1

Cross Machine Tool ZCOMP-L Linear Muzzle Device 1

The new Cross Machine Tool ZCOMP-L linear comp should be available at an introductory price through Rainier Arms in the first week of January 2017. 

If you’re in the market for muzzle devices, billet receivers, red dot sight mounts, etc, head on over to www.CMTTAC.com and check out all that Cross Machine Tool has to offer.

If you’re an AR builder, you’d have to be hiding under a rock to not know who Cross Machine Tool is. They started out making billet lower receivers, then added billet uppers, innovative billet lowers with intregrated PDW stock systems, AR-10 receiver sets and muzzle brakes. Most recently they have introduced their UHPR line of handguards. First was the MOD1 which deleted all but the very front of the 12 o’clock picatinny rail. Today the new UHPR MOD2 M-LOK rails are available and they feature a full 12 o’clock picatinny rail section with M-LOK mounting slots at the 3, 6 and 9 o’clock positions. 

Cross Machine Tool CMT UHPR MOD 2 rails

Cross Machine Tool CMT UHPR MOD 2 rails 1

The new Cross Machine Tool UHPR MOD 2 handguards are available in 6.7″, 9.5″, 13.7″ and 15″ lengths. Rainier Arms has secured the exclusive introduction on these rails and is offering them at a limited time introductory price. These rails are a crazy good value with the 6.7″ starting at $138 all the way up to the 15″ which is still just $170. If you’re looking for an awesome new rail for your AR, head on over to www.RainierArms.com and snag one of these new CMT MOD2 rails.

Cross Machine Tool has introduced their new CFC 556 ZCOMP muzzle device. The ZCOMP is basically a do-all muzzle device that reduced Flash, Muzzle Rise and Recoil. It is also long enough to be pinned to a 14.5″ barrel bringing it to 16″ OAL and comes predrilled for this purpose. The CFC 556 ZCOMP is being offered through RainierArms at an Intro Price of just $75. Get in on this deal at www.RainierArms.com.

cmt-cfc-556-zcomp-1cmt-cfc-556-zcomp-1cmt-cfc-556-zcomp-1cmt-cfc-556-zcomp-1

Intro Price! $75.00

The CFC 556 (Combat Flash Compensator) A.K.A. the ZCOMP™ is a Hybrid muzzle device.The CFC 556 is designed to reduce and distort visible muzzle flash, reduce muzzle rise & mitigate felt recoil. Function of the CFC 556 muzzle device is equaled by the exceptional visible manufacturing quality & appearance of the muzzle device.

FEATURES
– Manufactured from 17-4 PH Stainless Steel
– QPQ Nitride finished for durability & corrsion protection-standard
– 1/2 28 RH ID threads
– .632″ max diameter
– Surface Hardness-68RC Substrate Hardness-30 RC (QPQ SS only)
– Weight- 2.2 ozs
– Caliber- 5.56mm / .223 Remington only
– Rating- Full Auto
– Zero porting on bottom side to reduce ground signature when fired from the prone position
– Zero porting on the top side center to reduce flash sight obstruction through optics/sights
– Large combustion chamber with ports on each side to aid flash distortion
– Aggressivley Textured front inner tang surfaces to aid flash distortion
– Outer tang styling cuts to match our Trademark magwell cuts on the UHP15 series lower receivers
– 3 forward ports between the tangs to aid flash distortion
– Pre-drilled for pinning to 14.5″ barrel to legal length (pin included)
– Crush washer included (not for suppressor use)
– Made in the USA

https://www.rainierarms.com/cmt-zcomp-combat-flash-compensator

Cross Machine Tool just released their new CFC ZCOMP muzzle device and are offering it at an outstanding introductory price this week only. The CFC ZCOMP will help reduce muzzle rise, flash and felt recoil while looking pretty sweet too. Check out the details below. Get the ZCOMP at an intro price of $75 at www.CMTTAC.com.

cmt-cfc-5-56-zcomp

The CFC 556 (Combat Flash Compensator) A.K.A. the ZCOMP™ is a Hybrid muzzle device.The CFC 556 is designed to reduce and distort visible muzzle flash, reduce muzzle rise & mitigate felt recoil. Function of the CFC 556 muzzle device is equaled by the exceptional visible manufacturing quality & appearance of the muzzle device.

FEATURES
–  Manufactured from 17-4 PH Stainless Steel
–  QPQ Nitride finished for durability & corrsion protection-standard
–  1/2 28 RH ID threads
–  .632″ max diameter
–  Surface Hardness-68RC Substrate Hardness-30 RC (QPQ SS only)
–  Weight- 2.2 ozs
–  Caliber- 5.56mm / .223 Remington only
–  Rating- Full Auto
–  Zero porting on bottom side to reduce ground signature when fired from the prone position
–  Zero porting on the top side center to reduce flash sight obstruction through optics/sights
–  Large combustion chamber with ports on each side to aid flash distortion
–  Aggressivley Textured front inner tang surfaces to aid flash distortion
–  Outer tang styling cuts to match our Trademark magwell cuts on the UHP15 series lower receivers
–  3 forward ports between the tangs to aid flash distortion
–  Pre-drilled for pinning to 14.5″ barrel to legal length (pin included)
–  Crush washer included (not for suppressor use)
–  Made in the USA

www.CMTTAC.com

Cross Machine Tool has been teasing us little sneak peeks of a mysterious 9mm PDW for some time but it wasn’t until now that they released information and full pictures of the ARMINI™. The ARMINI™ is a self contained 9mm PDW that takes Glock mags. It features Ambi Controls (something other 9mm AR’s don’t offer), a Non-Reciprocating Forward Side-Charging Handle and an awesome Side Folding Stock that locks into the rail system doubling as a Vertical Forward Grip. It is also extremely lightweight at just 3lb 4oz without the stock or 4lb 2oz with the stock.

The Patent Pending ARMINI™ can be seen at the Northwest Shooting Sports Expo this weekend August 27th -28th in Tacoma, WA. The ARMINI™ takes the term American Sub Gun to a whole new level. Although it may look similar to any other pistol caliber AR, it is not. Everything from the bolt, forward charging handle, receivers, buffer system has been designed around pistol caliber cartridges fed from a standard Glock magazine. Weights- 3lbs 4oz. Pistol configuration. 4lbs 2oz with folding buttstock/forward grip configuration.

Cross Machine Tool ARMINI PDW 1

Cross Machine Tool ARMINI PDW 2

Left side of the ARMINI™ that displays the patent pending design functions of the folding buttstock/forward grip combination & the non reciprocating forward charging handle.

Cross Machine Tool ARMINI PDW 2

Cross Machine Tool ARMINI PDW 2

The Cross Machine Tool ARMINI™ will be exclusively licensed to Rainier Arms and will be available through the Rainier Arms website or in-store. You’ll also be happy to hear that the ARMINI™ will be sold in a “Pistol” configuration with the stock being sold as an optional product. This makes it so you can purchase your firearm and take it home with you, then submit a Form 1 to SBR it when you’re ready. Production Cross Machine Tool ARMINI’s™ will be available Early 2017. 

??www.CMTTAC.com??

Cross Machine Tool has recently started to build on their brand offerings with some new products. The CRC (Combat Recoil Compensator) muzzle device is one of those new products. The CRC features dual side ports and forward angled top ports to reduce muzzle rise. The tip of the muzzle device also is machine to mimic the machining on the front of the UPH15 lower receiver mag well. Muzzle brakes are just the beginning as new rails will soon be rolling out as well. The CRC 556 muzzle device is currently in-stock and available at www.RainierArms.com.

CMT CRC 556 Muzzle Device 1CMT CRC 556 Muzzle Device 1CMT CRC 556 Muzzle Device 1CMT CRC 556 Muzzle Device 1

Two forward angle brake ports on the  CRC 556  provide greatly reduced muzzle rise & mitigate felt recoil while the front forks distort and reduce flash signature. The external machined flutes on the front flash forks not only reduce the overall weight of the device but also blend with the aesthetic appearance of our Trademark magwell grooves on CMT UHP15 series Lower receivers. Function of the CRC 556 muzzle device is equaled by the exceptional visible manufacturing quality & apprearence you expect from Cross Machine Tool products. MADE IN USA

CMT CRC 556 Muzzle Device 1Photo by Stickman

FEATURES
– Manufactured from  Stainless Steel (standard- G5 Titanium available)
– Standard-QPQ Nitride finished for durability & corrsion protection-standard
– 1/2 28 RH ID threads
– .632″ max diameter
– Surface Hardness-68RC Substrate Hardness-30 RC (QPQ SS only)
– Weight- 2.7oz. SS model      1.5oz. Grade 5 Titanium model
– Caliber- 5.56mm / .223 Remington only
– Rating- Full Auto
– Zero porting on bottom side to reduce ground signature when fired from the prone position
– Zero porting on the center top side to reduce flash sight obstruction through optics/sights
– 2 forward angled progressive side exhaust chambers
– Outer tang styling cuts to match Trademark magwell grooves on UHP15 series lower receivers
– Pre-drilled for pinning to 14.5″ barrel to legal length (pin included)
– Crush washer included (not for suppressor use)
– Made in the USA

I’ve seen a lot of “random” price bumps lately one products including BCGs, magazines, etc. so any time I can I try to support companies that are trying to keep pricing normal even during times where stuff is moving a lot faster than it has been. My friends at Cross Machine Tool didn’t tell me this but I just saw that they got a restock on their very nice M16 BCGs in Phosphate, Nitride and Nickel Boron finishes. On top of offering them at a great price they are also offering Free Shipping. Not sure how long these will be in-stock so hurry up and snag one for your next build.

Cross Machine Tool Phosphate M16 BCG – $119.50 w/Free Shipping

Cross Machin Tool Phosphate M16 BCG

Cross Machine Tool NITRIDE M16 BCG – $129.50 w/Free Shipping

Cross Machine Tool NITRIDE M16 BCG

Cross Machine Tool Nickel Boron NiB M16 BCG – $139.50 w/Free Shipping

Cross Machine Tool NiB BCG

If you are a fan of a good clean looking design on your AR lower but still want some of the nicer high end features, you’re gonna love the new SSA or Smooth Side Ambi lower from Cross Machine Tool. The SSA Lower has all of the same great Ambi features of the Cross Machine Tool UHP15A lower but features a clean look with no corporate branding or Logo. 

As you can see below, the CMT SSA lower features a very nice flared mag well, crisp lines, extremely low key brand and serial number text, is compatible with the Battle Arms short throw ambi safety and features a very nice ambi mag release.

Cross Machine Tool SSA ambi lower 4

Cross Machine Tool SSA ambi lower 4

It also features a nicely executed ambi bolt release. You can see in this photo that the serial number is placed just below the trigger pin hole for a super clean look.

Cross Machine Tool SSA ambi lower 4

Cross Machine Tool SSA ambi lower 4

Cross Machine Tool is going to offer the new SSA lower at a super short-term intro price of just $199.99 which is an outstanding value for a great looking brand new lower that has all the same features as their extremely popular UHP15A ambi billet lower. I gotta say, with ATF-41P and possible gun control legislation looming right around the corner I have been looking for a new lower to SBR and this fits the bill perfectly. Head on over to www.CMTTAC.com and snag one for yourself at the intro price.

For a few years now, I have wanted to build a 9mm AR that takes Glock magazines. Mainly because the handgun I carry every day is a Glock 19. About a month ago I finally built my 9mm AR and it has been awesome. From the first round down the pipe it has run like a sewing machine with zero failures and the bolt hold open on last round is even working. Since then I have had a ton of questions asking me what specific parts I used in my build so I wanted to put all of the details together in on place for people to see and get information from. Once I have had a chance to put a ton more round through it I will follow up with a review as well.

QC10 9mm Build 0

My build started with Quarter Circle 10. They seem to be leading the pack in innovation regarding pistol caliber AR’s. They offer a Glock Small Frame lower for 9mm, 40SW, 357Sig, a Glock Large Frame lower for 45ACP and 10mm and a Colt 9mm lower as well as bolts and barrels for these as well. I wanted my AR to take the same mags as my Glock 19 so I went with the stripped Glock Small Frame 9mm Lower, 9mm BCG and 9mm 7.5″ barrel. Any AR-15 upper will do but I use a Rainier Arms mil spec forged upper minus forward assist. QC10 will be coming out with their own side charging upper with pistol caliber ejection port soon too. I also used an ALG Defense ACT trigger and need to upgrade to an ambi safety soon.

QC10 9mm Build 0

I covered the barrel with an SLR Rifleworks 8″ Solo Ultra Lite M-LOK rail. SLR rails are becoming one of my personal favorites. With such a short rail I decided to put an Arisaka Defense M-LOK Finger Stop underneath it. Its just small enough to not be in the way but big enough to keep your hand from getting too far forward. You may have noticed already but the QC10 barrels are straight blow back and do not require a Gas Tube or Gas Block.

QC10 9mm Build 2

QC10 9mm Build 2

For the muzzle device I chose the new 9mm Linear Comp from Kaw Valley Precision. I have used KVP’s Linear Comps for 300BLk and 5.56 before and the work great. Now they offer the same product in a 9mm version with a 1/2×28 thread pitch which is what I needed for the QC10 barrel. The fact that my barrel was shorter than my rail made the KVP linear comp a no brainer but it also looks sweet only sticking half way out the rail.

QC10 9mm Build 2

For my optic I chose a Vortex Optics RAZOR 3MOA red dot and mounted it to a Cross Machine Tool red dot sight mount. This is a nice light weight, compact optic setup that I feel has very fast target acquisition.

QC10 9mm Build 5

One item I recently installed was the Law Tactical Gen3 Folding Stock Adapter. At the moment I have this gun set up as an AR Pistol but will be converting it to a registered SBR with a stock soon. I love how compact the folding stock adapter makes this for transport. I can fit it in a small backpack, bag, case, etc without having to separate the upper and lower. It is quickly ready to shoot by flipping the buffer tube straight as you remove it from its concealment.

QC10 9mm Build 6

QC10 9mm Build 7

I was able to remove the extra weight at the rear of the carrier by removing the large roll pin and sliding it out. That is where the carrier extension for the Law Tactical Folding Stock Adapter goes.

QC10 9mm Build 7

The Law Tactical Gen3 Folding Stock Adapter has a lowered hinge to keep it away from your knuckles but just to be sure I am using a Fortis Manufacturing Hammer charging handle which has a really nice sized lever on it. The Hammer is one of my go to charging handles. Great build quality and affordable. 

QC10 9mm Build 7

Originally I started out with a standard carbine buffer spring and carbine buffer combo. It worked just fine but the guys at QC10 told me they recommend a heavier buffer, somewhere in the 5-6 ounce range to slow the carrier down a bit. I installed a Damage Industries 5.4 ounce H3 buffer and it continues to run perfect. 

QC10 9mm Build 7

Aside from a custom mag release and bolt catch assembly, the QC10 lower takes normal mil spec parts kits. You can see the Bolt Catch itself is mil spec but it is actuated by a pre-installed lever that contacts the magazine follower. This tends to be an issue with some mags as the spring pressure isn’t always strong enough to press the lever up and activate the bolt catch. This can be remedied by installing Wolf High Power springs inside the magazine. I bought a couple of SGM Tactical 33rd magazines from AIM Surplus and they seem to have better springs than the OEM ones. So far they are activating the LRBHO (last round bolt hold open) every time. 

QC10 9mm Build 7

So, there you have it. That’s pretty much my build in a nut shell. As I always tell people who are intimidated with building their own AR, “Its easier than you think”. You’ll love the increased range and accuracy you get out of a 9mm AR and being able to carry one type of mags to feed both your Primary and Secondary is awesome. Let me know if you guys have any questions or comments.

QC10 9mm Build 7

Have you seen the new “Hex” billet lower from Cross Machine Tool? The CMT Hex lower features a hex pattern that matches up perfect to the pattern on the very popular HexMag with a new contoured front mag well and an updated style integrated trigger guard. It will be compatible with Battle Arms Short Throw Ambi Safeties and will also feature the threaded bolt catch pin like all other CMT receivers making assembly roll-pin-less and simple. Rainier Arms has secured the first batch of CMT Hex billet lowers and is letting us put in pre-orders now as they expect these to go fast once they arrive.

You can pre-order the new CMT Hex billet lower and pick up some HexMags at www.RainierArms.com.

CMT Hex Lower 1CMT Hex Lower 1CMT Hex Lower 1CMT Hex Lower 1CMT Hex Lower 1CMT Hex Lower 1

The much anticipated UHP15-PDW Lower/Stock system is finally here. Cross Machine Tool just shipped the first units to Rainier Arms which should be arriving any day. This is a very high quality ambi billet lower that also includes an improved PDW style stock and Cheek Rest with many patent pending improvements. You can use any BCG you want as well which is a nice upgrade. If you are looking for a special lower to build an SBR with, something that not only is better than other designs but very limited in availability as well, this is for you. If you’re trying to build an SBR on a budget, you might as well just keep scrolling. 🙂

Pre-Orders are not usually something that Rainier Arms offers but with the limited availability and huge interest that is what they are offering. This first shipment should be in and shipping out to those who pre-order by June 23rd. Pre-order now at www.RainierArms.com.

Cross Machine Tool PDW Lower 1Cross Machine Tool PDW Lower 1Cross Machine Tool PDW Lower 1

Cross Machine Tool PDW Lower 1

The UHP15PDW Lower receiver features the Integration of a Patent Pending Monolithic adjustable PDW type stock system. This Patent Pending Monolithic stock/lower receiver design is the result of a collaboration between BattleArms Development & Cross Machine Tool. The UHP15PDW lower also includes the Ambi Bolt release & Ambi Mag Release Lever similiar to the UHP15A lower receiver. The Ambi Mag release Lever is designed to work in conjunction with the Standard Mil-Spec Mag catch arm without the requirement of proprietary components for proper function. This mag release lever design provides the user field repair options of the mag catch typically not found with most ambi mag release systems that utilize proprietary mag catch arms. The Ambi Mag Release features a raised fence on 3 sides to protect the mag release from accidental actuation during weapon use. The Bolt release Lever & Mag Release Lever feature aggressive Texturing to ensure proper finger placement & grip during actuation. The ambi bolt release, ambi mag release & buttstock adjustment rods are Black Nitrided for corrosion protection. The Integration of the stock rod system with the lower receiver creates a stonger continuous PDW platform & also allows for the addition of a cheek weld that extends with the buttstock not currently found with bolt on PDW stocks due to the bolt on housing design that extends rearward over the buffer tube.

 -  5 AXIS CNC MACHINED FROM 7075 T6 BILLET
 -  TYPE III CLASS II ANODIZED BLACK
 -  WIRE EDM MAG-WELL PROFILE
 -  .154” DIAMETER REAMED TRIGGER & HAMMER PIN HOLES
 -  MULTI CAL MARKED
 -  INTEGRALLY MACHINED TRIGGER GUARD
 -  3.3oz TUNGSTEN WEIGHTED BUFFER W/SPRING
 -  INDUSTRIES SMOOTHEST WIRE EDM CUT FLARED MAGWELL, COMPATIBLE WITH USGI AND 
    MAGPUL GEN 2/3 MAGAZINES
 -  NO ROLL PINS NEEDED FOR ASSEMBLY
 -  UPPER TENSIONING SCREW
 -  BOLT CATCH ASSEMBLY SCREW
 -  LIFETIME WARRANTY AGAINST MANUFACTURE DEFECTS
 -  AMBI BOLT RELEASE/ HARDWARE
 -  AMBI MAG ARM RELEASE LEVER
 -  PATENENT PENDING INTEGRATED 4 POSITION STOCK WITH 4 INCHES OF PULL
 -  PATENT PENDING PDW STOCK CHEEK WELD
 -  PATENT PENDING PDW INTEGRATED STOCK ROD LINEAR BUSHING GUIDANCE SYSTEM
 -  PATENT PENDING STOCK BALL LOCK MECHANISM
 -  COMPATIBLE WITH STANDARD LOWER PARTS KITS
 -  WEIGHT COMPLETLY ASSEMBLED- 2LBS 4OZ. ( wt. includes standard LPK & grip not 
    included with the UHP15PDW)

http://www.rainierarms.com/uhp15pdw-integrated-lower-system