Category Archives: Rail System

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.

AERO Precision will be having a Father’s Day AR-15 Sale. On Father’s Day Only, use the discount code “BESTDADEVER” at checkout to save 10% off your order. You know you want some. Get it at www.AEROPrecisionUSA.com.

AERO Precision AR15 Fathers Day Sale

The AERO Precision Memorial Day Sale is live!
SAVE 15% sitewide + receive FREE SHIPPING on all orders.

Shop the sale – https://aeroprecisionusa.com/store-home/

AERO Precision Memorial Day Sale

“As we approach Memorial Day, it’s good to remember what this time is truly about. This weekend we make a concerted effort to reflect on the lives of our service men and women who have passed while serving our country. We celebrate their legacy, and recognize the freedoms that their sacrifices have afforded all citizens of the United States of America. Enjoy savings site wide while joining us in honoring their service and sacrifice.”

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

 

Geissele Automatics just introduced two new products and as always …. Geissele does not disappoint.

First up is the new Airborne Charging Handle which is a nearly identical copy to the original Super Charging Handle except that the ambi levers are shorter making it more low profile. As you can imagine by the name, this model was designed for some special guys who like to jump out of planes with guns but you too can get your hands on these new charing handles at www.Geissele.com.

Geissele Airborne Charging Handle

Now for a sneak peek at the new Geissele SMR MK13 rail. The MK13 is a slimmer and lighter version of the typical Geissele rail. It does have the picatinny rail sections machined in at the 3, 6 and 9 o’clock spots similar to the MK4. You can sign up for notifications at Geissele.com. These will be available for purchase very soon.

Geissele SMR MK13 Rail

I was literally just mentioning the other day how “an AR with an American Flag finish gets me every time”. Apparently AERO Precision was listening because their new Builder Set for the month of March is just that. The March Builder Set comes with a Forged Lower, Trigger Guard, M4E1 Forged Upper and Gen2 Enhanced Handguard (MLOK or KeyMod). All of the parts have a dark gray base cerakote finish and the receiver set has a silver American Flag as well that looks awesome. As always, this is a limited edition set and once it’s gone it won’t be coming back. Get your hands on this unique builder set at www.AEROPrecisionUSA.com

AERO Precision m4e1-march-builder-set-american Flag 3

This package deal includes the finished pieces you need to assemble your own American Flag Cerakote M4E1 Rifle, including an M4E1 Enhanced Upper Receiver, AR15 Gen 2 Lower Receiver, Gen 2 Enhanced Handguard of choice and Billet Trigger Guard all finished in American Flag Cerakote. Stand out at the range with a unique and eye catching build. This is a one time offer for this finish – once they are gone, they are gone!

AERO Precision m4e1-march-builder-set-american Flag 1AERO Precision m4e1-march-builder-set-american Flag 1AERO Precision m4e1-march-builder-set-american Flag 2AERO Precision m4e1-march-builder-set-american Flag 4AERO Precision m4e1-march-builder-set-american Flag 5

Includes:
– M4E1 Enhanced Upper Receiver finished in American Flag Cerakote. Upper receiver is assembled and includes the forward assist, dust cover and barrel nut.
– AR15 Gen 2 Stripped Lower Receiver finished in American Flag Cerakote
– 15″ Enhanced Gen 2 KeyMod or M-LOK Handguard finished in American Flag Cerakote
– Billet Trigger Guard in American Flag Cerakote

https://aeroprecisionusa.com/m4e1-american-flag-cerakote-builder-set.html

Custom Cerakote Finish done by Hillbilly 223 Urban Finishes.

Faxon Firearms has been pumping out new products at a blistering pace lately and one of their newest products is a Carbon Fiber Handguard. You might be wondering “Why would I want a Carbon Fiber Handguard?”. Well for starters, Carbon Fiber is 10x stronger than aluminum and 40% lighter. The new 15″ Carbon Fiber handguard weighs just 7.99 oz with a steel barrel nut. It looks pretty sick too.

Faxon Firearms Carbon Fiber Handguard 2Faxon Firearms Carbon Fiber Handguard 2

Fusing Faxon’s innovation and engineering with Lancer Systems’ carbon fiber know-how, the STREAMLINE Carbon Fiber Handguard maximizes carbon fiber’s unique rugged characteristics with practical application. The rail features 8 complete M-LOK facets for mounting accessories and uses standard AR-15 barrel nuts for mounting to the rifle, driving weight down, while maintaining decades-proven mounting systems.

Optional accessories are available for shooters to maintain co-witness of optics and accessories and when combined with titanium barrel nuts, drive the weight for a practical 15″ handguard below XXX ounces. Already proven on champion competition rifles, the STREAMLINE Carbon Fiber Handguard is rugged and ready for anything a shooter can throw at it.

Features:
–    Extreme lightweight without sacrificing strength, rigidity, or practicality.
–   M-LOK attachment across 8 facets.
–   Dramatically increases maneuverability of the weapon over metal rails.
–   Low heat transfer for handing extreme duty cycles.
–   Fits common suppressors under-rail
–   Attaches with standard armorer’s wrenches and tools.
–   Co-witness iron sights and optics/lasers (Requires optional low-profile M-LOK rail adapters.)

Specifications:
–    Length: 15.0″
–   Weight w/o Barrel Nut (Includes ALL Mounting Hardware): 6.71 Ounces
–   Weight, Steel Barrel Nut: 1.28 Ounces
–   Weight, Titanium Barrel Nut: .77 Ounces
–   Height (Flat to Flat): 1.98″
–   Max Outer Diameter (Peak to Peak): 2.05″
–   Max Inner Diameter (Front Aluminum Ring):  1.70″
–   Construction: Carbon Fiber & Aerospace Aluminum – Type III Hard Anodized
–   Accessory Mounting: M-LOK
–   Attachment Method: Standard AR-15 Barrel Nut, Patent-Pending Clamp Architecture

Includes:
–    Steel AR-15 Barrel Nut
–   15″ STREAMLINE Carbon Fiber Rail
–   All Mounting Hardware

The new Faxon Firearms 15″ Carbon Fiber handguards are now available through Rainier Arms at an introductory price of $299.95 while supplies last. Head on over and pick one up at www.RainierArms.com.

Lantac is about to release their new M-LOK version of their popular SPADA handguard and we’ve got some pictures. The new M-LOK models will be available in two variations, the SPADA-ML and SPADA-M. Basically the SPADA-ML removes the raised QD sling attachment points to reduce weight. The SPADA-M is shown below. Looks like I need to start planning a new build. 🙂

Lantac SPADA-M Handguard MLOK 1

Lantac SPADA-M Handguard MLOK 1

Lantac Spada-M & Spada-ML Hanguards are precision machined from extruded 6061-T6 alloy. Anodized Type3 Class2 Hard Coat.
Key clamping areas screw holes are reinforced with Helicoil inserts.
Durable and robust design with ultra narrow diameter, 1.55” OD.

The Spada-M features ambidextrous QD mounting points as found in the Spada-S while the Spada-ML (Lighter Version) has these removed to reduce weight further.

New lightening cuts in the handguard create and distinctive design look and reduced weight, M-Lok slots machined into the 3, 6 & 9ocklock surfaces allow fast and secure mounting of your accessories.

Muzzle facing notches allow mounting of BMD’s closer to the end of the handguard too.

Zero protrusion over upper receivers allows the handguard to be mounted to any upper regardless of its shape or size.
Patented anti slip and rotation system, strengthens the handguard in the barrel nut area and allows strong clamping force to be applied to the barrel nut itself.
The handguard cannot be removed from the barrel nut without removing all three fixing screws.
Screws are grade 8 Steel, Black Oxide Finish.

https://www.lantac-usa.com

If you’ve been wondering what AERO’s February Builder Set would look like, wonder no more. AERO’s February Builder Set is now available and they definitely didn’t disappoint. This month they are doing a Limited Run of M4E1 Upper Receiver, Gen2 Stripped Lower Receiver, 15″ Enhanced Gen2 Handguard (KeyMod or MLOK) and a Billet Trigger Guard all finished in a Cobalt Cerakot. I’ve always been a fan of this color for a rifle and it would look fantastic with a set of black AR furniture. If you’re looking for a quick start to your next build, check these out at www.AEROPrecision.com.

AERO Precision February m4e1-em15-builder-set-cobalt-1AERO Precision February m4e1-em15-builder-set-cobalt-3AERO Precision February m4e1-em15-builder-set-cobalt-2

This package deal includes the finished pieces you need to assemble your own Cobalt Cerakote M4E1 Rifle, including an M4E1 Enhanced Upper Receiver, AR15 Gen 2 Lower Receiver, Gen 2 Enhanced Handguard of choice and Billet Trigger Guard all finished in Cobalt Cerakote. Stand out at the range with a unique and eye catching build. This is a one time offer for this finish – once they are gone, they are gone!

Includes:
– M4E1 Enhanced Upper Receiver finished in Cobalt Cerakote. Upper receiver is assembled and includes the forward assist, dust cover and barrel nut.
– AR15 Gen 2 Stripped Lower Receiver finished in Cobalt Cerakote
– 15″ Enhanced Gen 2 KeyMod or M-LOK Handguard finished in Cobalt Cerakote
– Billet Trigger Guard in Cobalt Cerakote

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.

The Centurion Arms 20% OFF BLACK FRIDAY SALES START NOW!! This sale includes Centurion Arms Rails, Complete Uppers, Barrels and CMR Accessories. Just add items to your shopping cart to see your discount. Head on over to www.CenturionArms.com to get in on the sale.

centurion-arms-black-friday-2016-sale

**Excludes BCGs, Blem Rails and replacement parts

If you’ve been looking for something absolutely awesome and unique to start your next build, you have to check this out! AERO Precision has a limited edition run of M4E1 builder sets (includes the enhanced upper receiver, lower, trigger guard and rail) with a Nickel Boron Battleworn finish. We’ve all seen the Battleworn Cerakote finished but its a safe bet that nobody you know has Battleworn NiB. This thing looks absolutely awesome and should make for a very durable finish too. Keep in mind this Battleworn NiB finish is not cheap to do but nothing special is. These sets are available in both KeyMod and MLOK now at www.AEROPrecisionUSA.com.

aero-precision-october-builder-set-battleworn-nib-1aero-precision-october-builder-set-battleworn-nib-1aero-precision-october-builder-set-battleworn-nib-mlokaero-precision-october-builder-set-battleworn-nib-keymod

Our October Builder Set features an AR15 M4E1 set with a Nickel Boron plated Battleworn (NIB Battleworn™) finish by Legal Manufacturing, LLC.

This package deal includes the finished pieces you need to assemble your own Nickel Boron plated Battleworn M4E1 Rifle, including an M4E1 Upper Receiver, AR15 Gen 2 Lower Receiver, Enhanced Handguard of choice and Billet Trigger Guard. Stand out at the range with a unique and eye catching build. This is a one time offer for this finish – once they are gone, they are gone!

Includes:
– M4E1 Enhanced Upper Receiver finished in NIB Battleworn™. Upper receiver is assembled and includes the forward assist, dust cover and barrel nut.
– AR15 Gen 2 Stripped Lower Receiver finished in NIB Battleworn™
– 12″ or 15″ KeyMod or M-LOK Handguard finished in NIB Battleworn™
– Billet Trigger Guard finished in NIB Battleworn™

REHV Arms has introduced their new XPX 15.5″ M-LOK handguard. The XPX rail features M-LOK slots at the 3, 6 and 9 o’clock and a full length run of picatinny at 12 o’clock. There is also 6 QD sling attachment points integrated into the rail (3 at the rear and 3 at the front). The handguard has a cutback at the front for a unique look. Take a look at the pics and details below. The XPX handguard is available for purchase at www.REHVArms.com.

The REHV (XPX-15-MLOK)” Rail System has an overall length of 15.5″; It’s Enhanced features include a machined one piece billet aluminum extruded rail which is much stronger and more rigid than 2 piece rail systems.  The XPX-15 MLOK Provides (3) Rear QD slots that are integrated into the left, right and bottom and 3 in the front.

rehv-arms-xpx-rail-1rehv-arms-xpx-rail-1

Designed to be used in with a (Micro/Low Profile Gas Block) on a (Carbine length, Midlength or Rifle gas system).  This rail system gives the user a more ” rigid” way to mount various accessories available to their AR15 platform.

rehv-arms-xpx-rail-1

FEATURES:
–  Free Floating
–  CNC machined from 6061-T6 Aircraft Grade Aluminum
–  Single Piece Billet Machined Extrusion
–  Rail Weight: 10.3 oz.
–  Barrel Nut Weight: 1.6 oz.
–  (3) Rear QD Sockets
–  (3) Front QD Sockets
–  Anti Rotation Design
–  Solid mount interface
–  Ultra Sleek Industrial Appearance
–  Mil-Spec 1913 Picatinny Rails
–  Mil-Spec Type III Hard Coat Anodized
–  Inside Diameter: 1.28 inches
–  Width: 2.09 inches
–  Provides a Continuous Upper Rail
–  Made in the USA

INCLUDES:
–  Barrel Nut
–  Shims
–  Hex key
–  Instructions
–  Screws

AERO Precision just announced their September Builder Set. This month they are doing an M4E1 set in Magpul Stealth Grey. The Builder Set includes an AERO Precision forged lower, trigger guard, M4E1 enhanced upper and handguard (12″ or 15″, MLOK or KeyMod), all finished in a Magpul Stealth Grey Cerakote. If you’re looking for a great start to your next build, jump on this awesome kit. 

www.AEROPrecisionUSA.com

aero-precision-september-builder-set-magpul-stealth-grey

This package deal includes the finished pieces you need to assemble your own Magpul™ Stealth Grey M4E1 Rifle, including an M4E1 Upper Receiver, AR15 Gen 2 Lower Receiver, Enhanced Handguard of choice and Billet Trigger Guard. Stand out at the range with a unique and eye catching build. This is a one time offer for this finish – once they are gone, they are gone!

Includes:
– M4E1 Enhanced Upper Receiver finished in Magpul™ Stealth Grey. Upper receiver is assembled and includes the forward assist, dust cover and barrel nut.
– AR15 Gen 2 Stripped Lower Receiver finished in Magpul™ Stealth Grey
– 12″ or 15″ KeyMod or M-LOK Handguard finished in Magpul™ Stealth Grey
– Billet Trigger Guard finished in Magpul™ Stealth Grey

http://aeroprecisionusa.com/m4e1-magpul-stealth-grey-builder-set.html