- BUILD OF THE MONTH ● MARCH 2026
AT3 & STNGR 5.56 3-Gun Rifle Kit
This rifle is built for speed and precision. Every component in this build was selected to minimize recoil, maximize performance and reliability for competition use.
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About the build
This rifle is built for speed and precision. We started with an AT3 AT-15 Forged Lower Receiver and paired it with an AT3 Slick Side Billet Upper. The handguard is a STNGR VLCN 15 to help keep the weight as low as possible, while giving you all the M-LOK Slots you could want. This combination provides a lightweight and durable foundation.See Full Secs
For optics, we mounted an AT3 Red Tail 1-6×24 Rifle Scope alongside an AT3 ACE Pistol Red Dot Sight on a 45-degree offset mount. This setup allows for quick transitions between close quarters and mid-range targets. Every component in this build was selected to maximize performance and reliability.
Inside the AR is a Rise Armament Trigger, and light weight Bolt Carrier Group, that is paired up with the Faxon Adjustable gas block, making this gun super tuneable for the ammo you want to use.
Controls are all CMMG with their Zeroed Extended Bolt Catch plus their Ambi Mag Catch/Release. For the safety this build is outfitted with CMMG’s 60 or 90 degree throw Ambi-Safety.
Upper Receiver Parts
The upper receiver assembly centers around an AT3 Slick Side Billet Upper and a STNGR VLCN M-Lok 15.5-inch Free Float Handguard. Inside, it features an AT3 16-inch 5.56 NATO Pencil Profile Barrel which keeps the front end light and easy to maneuver. We equipped the upper with a Rise Armament Low-Mass Nickel Boron Bolt Carrier Group and a Rise Armament Ambidextrous Charging Handle for smooth cycling. The barrel is finished with a Fortis 5.56 NATO Muzzle Brake to significantly reduce recoil and muzzle rise.
Lower Receiver Parts
The lower receiver utilizes the AT3 Tactical AT-15 Forged Lower paired with premium upgraded controls. We installed a Rise Armament Rave 140 Flat Super Sporting Trigger for a crisp and clean break. The lower also features a full suite of CMMG ZEROED Ambidextrous components including the safety selector, magazine catch, and extended bolt catch. To complete the lower, we added a Mission First Tactical Extreme Duty Minimalist Stock and ENGAGE Pistol Grip for excellent ergonomics. An Armaspec Gen 4 Stealth Recoil Spring ensures quiet and reliable operation shot after shot.
