AR15NEWS.COM – Your AR-15 news source!

AR15NEWS.COM – Your AR-15 news source for all new AR-15 accessories, tactical gear and product reviews!

Build Details: Quarter Circle 10 Glock Compatible 9mm AR

Posted on September 10th, 2015 by ar15news

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

Cross Machine Tool Hex Lower Pre-Order

Posted on August 7th, 2015 by ar15news

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

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


Posted on June 18th, 2015 by ar15news

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

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.

 -  WEIGHT COMPLETLY ASSEMBLED- 2LBS 4OZ. ( wt. includes standard LPK & grip not 
    included with the UHP15PDW)


Posted on March 26th, 2015 by ar15news

Here is a Sneak Peek at a joint development between Battle Arms Development and CMT Tactical, the Integral PDW STOCK assembly which is not an add-on option but a monolithic design completely machined into the lower receiver. Coming from someone who owns PDW stock from another manufacturer, I can tell you that this system will pretty much fix all of the issues associated with other PDW style stocks on the market.

The production PDW STOCK Length will come in at under 4.5″ (prototype shown is 5.75″). This Integral PDW STOCK assembly uses a standard bolt carrier and retains the ability to shotgun the upper which is typically not possible with PDW style stocks. It also features some additional improvements such as ultra smooth guid rods with bushing, stainless steel ball bearing rolling and locking mechanism, strong dimpled rod locking positions, stock is lockable in both directions, adjustable/tune able buffer up to H2 weight, built in QD positions, ability to lock back BCG, etc. One of the improvements that I like the most is the fact that it has a cheek rest. I have a PDW style stock WITHOUT a cheek rest and its not what I would call an ideal setup. As you can imagine, this setup has Multiple PATENTS PENDING!

BAD CMT PDW Stock Prototype 1

BAD CMT PDW Stock Prototype 1

BAD CMT PDW Stock Prototype 1

Unique Features/Improvements of this new PDW STOCK/RECEIVER:
1. Lightweight but strong monolithic design from the ground up for the PDW style stock. Less bulk vs add-on versions.
2. Use standard Bolt Carrier, no proprietary carrier (when combined w
ith the new Battle Arms PDW Buffer & Spring System)
3. Ability to shotgun the upper for field service.
4. Stronger & Lightweight dimpled rail design, no large slot cuts in the rail that weakens the stock.
5. Smooth, stainless steel ball bearing like action…wait, it is on ball bearings!
6. Continuous cheek weld!
7. Lockable in both directions
8. Easy single motion latch release, no need to fumble with two hands to get the stock released.
9. Compact, 4.5″ overall length collapsed…about 1″ shorter than the prototype.
10. Ability to lock back BCG.
11. Ability to “Tune” the rifle with different “reciprocating weight” buffers, up to the equivalent of a H2. Normally you have only one choice for proprietary buffer.
12. Quiet locking mechanism for stealth.

They are hoping to release the Integral PDW Lower Receiver and Stock some time this summer so start getting ready now. No pricing information has been released but you can kind of come up with an idea of a number if you understand that you will be buying a lower receiver and PDW stock assembly together. If you would like to keep informed as this product progresses through the final design changes, click on the links below and follow their respective Facebook and Instagram pages closely.

Battle Arms Development Facebook Page
Battle Arms Development Instagram

CMT Tactical Facebook Page
CMT Tactical Instagram

NEW!! CMT Tactical UHP15A Billet Ambi Receiver Now Available

Posted on February 4th, 2015 by ar15news

For weeks…no months now, everyone has been asking “When can I buy that awesome CMT Tactical Ambi lower?”. Well, your wait is now over. Just yesterday CMT Tactical announced that they had opened sales for the new UHP15A ambi receiver. The new UHP15A features an Ambi Mag Release on the left side of the receiver and an Ambi Bolt Release on the right side of the receiver as you can see in the pictures below.

CMT Tactical UHP15A Ambi Lower 2

CMT Tactical UHP15A Ambi Lower 1

I’ve had my set for a while now and they really work great. The bolt release works just as you imagine, press the lever and it releases the bolt. The mag release is gated to protect agains accidental mag release but can still be actuated by the flat of your trigger finger, etc.

CMT Tactical UHP15A Ambi Lower 3

As with all of the different billet receivers CMT Tactical makes, the fit, finish and overall quality of the UHP15A is top tier and features a completely “roll-pin-less” assembly. The UHP15A ambi lowers are now available for purchase as just the UHP15A ambi receiver alone or in Upper and Lower Combo sets and will soon be available through and

Black Rifle Black Friday Sale 2014 – CMT Tactical

Posted on November 26th, 2014 by ar15news

CMT Tactical has some Ammo grade billet receiver sets (Ammo Grade means very minor cosmetic blemishes) on sale thru the holidays along with complete uppers & a couple other small items. Check these great deals out at the links below.  

CMT Tactical AR-15 “Ammo Grade” Billet Receiver Set

CMT Tactical Black Friday Sale 1 620

CMT Tactical PMR Complete Uppper

CMT Tactical Black Friday Sale 2 620

CMT Tactical 16″ BR Complete Upper

CMT Tactical Black Friday Sale 3 620

CMT Tactical UPUR-1 458 SOCOM Compatible Billet Upper Receiver

CMT Tactical Complete M16 Phosphate Bolt Carrier Group

Have a Great Thanksgiving & Merry Christmas!

Machine Your Own Billet Receivers In Class at CMT Tactical

Posted on September 19th, 2014 by ar15news

Ever wanted to machine your own AR-15 billet receivers with more than just your end mill or drill press? Here’s an awesome opportunity to do just that. CMT Tactical has decided to offer a “MACHINE YOUR OWN AR 15 RECEIVER EXPERIENCE CLASS” where you’ll spend an entire mid-November day at their facilities in Lexington, TN, machining your own receivers using the same machines CMT Tactical uses to make their awesome billet receivers on a daily basis. If this sounds like something you would like to participate in you better hurry. There are only 8 spots in this class and a few are already spoken for. Details below!

CMT Tactical billet receiver set class 1

CMT Tactical billet receiver set class 1

MACHINE YOUR OWN AR 15 RECEIVER EXPERIENCE CLASS  Friday November 14th 2014 7:30AM until approximatly 5:00pm Class Cost is $975.00 50%-$487.50 deposit required when reservation is made. Class is limited to 8 students

CLASS OBJECTIVE– Provide individuals with the Experience of machining & owning AR15 Receivers that they themselves machined in a World Class Manufacturing environment.

Attendee will machine their own upper & Lower AR15 Receivers.

Class Description– Attendees will be given detailed instruction at each stage of manufacturing on how to complete that stage of the manufacturing process. Once the attendee has been instructed, the Attendee would then load the machine with material & once his instructor confirmed the machine is properly loaded the Attendee would initiate the machine to begin machining his receiver at that stage. This would repeat thru all stages of the manufacturing process until the receivers are completed. Attendees will also be instructed on use of gages & gage requirements for each stage & expected to use gages to inspect the parts they are manufacturing.

Finished Receivers will be sent for Anodizing & shipped to designated FFL approximately 2-3 weeks after class completion. Unless student decides to take receivers Non-Anodized the days of training completion ( Tn. Resident students only)

The receivers will not be considered an 80% Receiver

For additional information and to reserve your spot in the class, head on over to

Sneak Peek!! CMT Tactical Left Side Eject Billet Upper

Posted on August 18th, 2014 by ar15news

CMT Tactical has really been cranking out new products lately and I don’t think they have any plans to slow down. Here’s a little sneak peek at a project they are working on right now. CMT Tactical just prototyped their first Lefty version of their awesome billet UPUR upper. The best part is it doesn’t look like an afterthought like most left hand eject uppers. It features a forward assist and shell deflector on the left hand as well making it a true left hand setup. Not to mention it has the usual CMT Tactical sexy lines.

CMT Tactical UPUR Lefty AR-15 Upper 2 copy

CMT Tactical UPUR Lefty AR-15 Upper 2 copy

As of right now its just a prototype and no availability timeframe was mentioned. I’m sure if there is enough interest and demand for this new Lefty upper, CMT Tactical will make it happen. Be sure to stop on over at the CMT Tactical Facebook page and let them know if you want them to make this Southpaw Dream a reality. You can also take a look at to check out their full line of billet lowers and uppers. 

CMT Tactical has made a really great name for themselves with their great billet AR-15 upper and lower receivers and now they are coming out with their own line of complete uppers. Instead of just doing the typical AR upper, CMT Tactical is doing something pretty cool by offering a 20″ Predator Marksman Rifle upper as the first of many complete uppers.

CMT Tactical PMR Complete Upper 1

CMT Tactical PMR Complete Upper 1

The PMR upper includes a CMT Tactical UPUR-4 Slick Side billet upper receiver, 20″ 5.56 rifle length barrel, 15″ Samson Evolution rail, Low Profile Gas Block, BCM Gunfighter charging handle and a CMT M16 BCG. CMT Tactical also puts there money where there mouth is with an MOA accuracy guarantee. 

CMT Tactical PMR Complete Upper 1

CMT Tactical PMR Complete Upper 1

This complete upper would be great for those who are looking to rid the neighborhood of Coyotes or Bad Guys. At just $785, the price for this upper is very reasonable. You can also request the upper be built with a Dust Cover and Forward Assist for just $60 more. For more information or to purchase head on over to

Five New Billet Upper Versions from CMT Tactical

Posted on June 17th, 2014 by ar15news

CMT Tactical has been making some really nice billet upper and lower receivers for a while now. You might be thinking, “Yeah, everyone is making billet receivers now.” and you aren’t too far off. What’s setting CMT Tactical apart is their true dedication to quality and the fact that they are willing to develop additional variations of their receives to meet the needs of their customers and potential customers. Recently they introduced five, yes you read that correct F-I-V-E, new versions of their billet AR-15 upper receiver starting at just $128. I’ve listed these new uppers below. Two are in-stock now and the other three will be out next month. Check them out and see if any of them will work for your next build.

First up is the CMT Tactical UPUR-1A. This upper has all of the same features as the original UPUR-1 upper (forward assist, dust cover, 7075-T6 construction, etc) but now features an enlarged Ejection Port making it compatible with 458 SOCOM builds. This upper is in-stock now!

620 CMT Tactical UPUR-1a billet upper

Second is the CMT Tactical UPUR-2. The UPUR-2 is very similar to the standard CMT Tactical billet upper but they’ve removed the Forward Assist. It still has a Shell Deflector and a Dust Cover and is NOT compatible with 458 SOCOM builds. This upper will be available for purchase July 2014.

620 CMT Tactical UPUR-2 billet upper

The third new upper is the CMT Tactical UPUR-3 billet upper. Basically take the UPUR-1A and remove the dust cover and forward assist. You now have a Slick Side billet AR-15 upper that will work great for any AR build but has the enlarged Ejection Port for 458 SOCOM builds. This upper is in-stock now!

620 CMT Tactical UPUR-3 billet upper

The CMT Tactical UPUR-3A is the fourth new upper from CMT Tactical and basically expands on the UPUR-3 upper. This version has a cutout for side charging BCG’s and large enough Ejection Port opening to be compatible with 458 SOCOM builds. This upper will be available for purchase July 2014.

620 CMT Tactical UPUR-3a billet upper

The fifth and final new upper is the CMT Tactical UPUR-4. This upper is a new Slick Side version that addresses the concerns many people have with Slick Side uppers and that is the lack of a Dust Cover to keep contaminants out of the upper. The new UPUR-4 has no Forward Assist or Shell Deflector but it does still let you use a Dust Cover which is a cool feature. As with most of these new uppers the Ejection Port has been slight enlarged to work with 458 SOCOM builds. This upper will be available for purchase July 2014.

620 CMT Tactical UPUR-4 billet upper



    Phase 5 TacticalOnly The Best FirearmsUse the code Highest Quality Steel Target SystemsSpecializing in high end AR15s/M16s, parts & accessories556 TACTICAL - CUSTOM BUILT AR15 ASSAULT RIFLESTombstone Tactical - Tactical firearms and accessories!Modern Upgrades for Current Military Small ArmsSpecial Ops TacticalClick here to become an AR15NEWS Partner

Copyright © 2009 AR15NEWS.COM – Your AR-15 news source!.