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AR Pistol Build Details and Pictures

Posted on August 4th, 2014 by ar15news

I recently built a new sexy looking AR Pistol that I’ve been taking pictures of and have gotten quite a few questions about what components I used, why I set it up the way I did and how its running so far. Its been a while since I did a “Build Details” article so I figured since so many people were interested in this build I would do one on it. This article will basically be a run down of the different components as well as an explanation of why I used them if needed.

We’ve all seen some AR Pistols that have extremely short barrels/uppers. I tend to not go shorter than a 10.5″ barrel on mine as it’s short enough to make them more compact without sacrificing a ton of accuracy or velocity. This whole build started out with a mid length AERO Precision COP Upper and Forged Lower. This is the second AR I’ve built with this receiver set and I love them.

The Upper, as I mentioned, features an AERO Precision COP mid length upper with a Parallax Tactical TiN BCG, Magpul MBUS Pro sights and Fortis Mfg Hammer charging handle. For the optic I wanted something very small and compact so I went with the Vortex Optics RAZOR and an American Defense Mfg QD mount. The barrel is an ODIN Works 10.5″ .223 Wylde Stainless Steel barrel with a Primary Weapons CQB comp on the end. The combination of a shorter barrel and the CQB comp makes it perfect for a home defense weapon but the ODIN Works barrel definitely holds up to its reputation as a straight shooter and is absolutely capable of hitting longer range targets with ease. I’ll shoot some 100 yard groups soon and do another writeup for you guys on the accuracy of this 10.5″ AR Pistol.

AR Pistol Upper

The lower for this build is an AERO Precision lower that I bought as a set with the upper for this build. Both were Cerakoted Tungsten for a unique look. So far I’ve added a Battle Arms Development BAD-CASS-SA short throw selector and EPS Pins, Phase 5 Weapon Systems Winter Trigger Guard, Magpul K2 grip and an Impact Weapons Components QD End Plate sling mount. There is a new ALG Defense ACT trigger waiting for it down stairs that I need to install.

Another feature that should be standard on ALL AR Pistols is the combination of a Sig Sauer SB15 Arm Brace and an SB15 specific buffer tube such as the KAK Industry Super Sig Tube or Phase 5 Hex-2.  These buffer tubes push the SB15 further away from the receiver making the setup a bit more comfortable to shoulder (Shouldering the Sig SB15 is legal according to the ATF). For this build I installed the KAK Super Sig Tube and its awesome. You can even get an adjustment kit of rings that you slide on before installing the SB15 to adjust how far back it sits.

You also might notice the MagPod on the magazine. These will be available for purchase very soon!

AR Pistol Lower

The part I get questions about the most is the business end of the upper. Most people seem to really like this setup so here is a pretty detailed look at it. One of the other reasons I like muzzle devices like the CQB comp is that you can put a light right up to the end of the muzzle and not worry so much about it getting damaged in the blast of the rifle or coated in carbon. My setup consists of a Magpul AFG and a Haley Strategic Partners Thorntail Offset Mount with an INFORCE WML mounted on it. The Thorntail Offset Mount is made by Impact Weapons Components for HSP and is an awesome mount for the WML. It has four slots to mount the WML on and can even be mounted cantilevered like mine is.

IWC HSP Thorntail Offset Light Mount 1

As you can see the WML is pushed out almost to the tip of the muzzle. Pushing it further forward not only reduces shadowing in the light beam but also gives you a lot more real-estate to put your hand on a shorter rail. 

IWC HSP Thorntail Offset Light Mount 1

The next few pictures will show you a detailed look at the complete setup and hand position. While using the AFG I like to put my thumb on top of the rail for a solid grip. To activate the light, all you need to do is slide your thumb to the left and the activation button is right there. This is a very effective and comfortable setup.

IWC HSP Thorntail Offset Light Mount 1IWC HSP Thorntail Offset Light Mount 1IWC HSP Thorntail Offset Light Mount 1IWC HSP Thorntail Offset Light Mount 1

If you like this light setup and want to put it on your rifle or pistol build, I would recommend checking out They have the HSP Thorntail Offset Mount, Magpul AFG grip and INFORCE WML light all in-stock. Plus, if you use the discount code “ar15news” at checkout you’ll save 5% off your entire order. 

This is definitely my favorite AR Pistol build to date. After a few hundred rounds so far I can tell you it runs like a champ and is absolutely a blast to shoot. The bolt holds open on empty mag, no Failure to Eject, no Failure to Feed, etc. Just an all around accurate AR Pistol that I would not hesitate to grab when my life depended on it. 

IWC HSP Thorntail Offset Light Mount 1 IWC HSP Thorntail Offset Light Mount 1

AERO Precision
ALG Defense
American Defense Mfg
Battle Arms Development
Fortis Manufacturing
Impact Weapons Components

KAK Industry
ODIN Works
Parallax Tactical
Phase 5 Weapon Systems
Primary Weapons Systems
Sig Sauer
Vortex Optics

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