A3 Tactical Triad Bullpup Chassis For BRN-180 Upper Receiver - Pistol

The TRIAD is a Modular Bullpup Chassis, designed to house a standard Mil-spec AR receiver. It also uses a bufferless upper receiver. Once the Mil-spec receiver is installed, the upper receiver simply quick-pins in place just like a standard AR.

Why a Bullpup? Bullpups relocate the trigger and grip forward, greatly reducing the weapon's overall length without reducing the barrel length. This allows a bullpup to be more maneuverable and concealed more easily than a conventional weapon with a similar barrel length. The other main benefit is that it puts the center of mass closer to the shooter's core. This allows more control of the weapon, and much better balance. And if those weren't enough perks, Bullpups also have less muzzle rise, because the recoil impulse is transmitted more directly into the shooter's shoulder. This occurs because the action of the firearm is much closer to the butt plate than on conventional firearms.

One of the main benefits the TRIAD has over other Bullpup designs is the ability to swap barrel lengths and calibers in seconds with a simple upper swap (just like an AR). For example, the user could have 2 different uppers - a 10.5" 300 BLK upper with an optic, and a 16" 5.56 x 45 upper with a scope. The optics remain sighted on both uppers, and the user can swap between the two in less than a minute. There is no limit to this. During testing, they had 6 different uppers of various calibers and barrel lengths that they swapped back and forth. All were complete with optics already sighted in. By changing uppers and magazines in less than a minute, they can swap between 4 different calibers - 5.56x45, 7.62x39, 300BLK, and 9mm.

Breakdown of the kit components:

• 6061 aluminum front trigger housing/receiver
• 17-4 stainless MIM front trigger with QPQ coating
• 4140 steel Anti-walk trigger pins x 3
• A3 Tactical ambi selector with detent spring and detent
• 17-4 stainless front trigger linkage with QPQ coating
• 7075 aluminum transfer bar and rear linkage, bushed with 841 oil-embedded bronze bushings
• Acetal Delrin guide and trigger actuator
• 30% fiber-reinforced injection-molded Zytel polymer main chassis housing
• 4140 steel and 7075 aluminum threaded chassis inserts
• 6061 rear threaded buffer adapter
• 4140 quick-disconnect (QD) sockets x3 with pistol
• 4140 steel mag release
• 7075 extended right-side mag release button
• 7075 left-side mag release lever
• Injection-molded Zytel polymer front trigger housing cap,
• 30% fiber-reinforced injection-molded Zytel polymer rear butt-plate support
• Injection-molded Zytel polymer rear cap w/4140 quick-disconnect sling socket
• 4140 ball detent takedown pins x 3
• A3T XENO-patterned reduced angle polymer grip - 30% fiber-reinforced Zytel
• Rise Armament RAVE 140 drop-in trigger

Please NOTE:

• This specific TRIAD kit only works with the Brownells BRN-180 bufferless upper receivers. If you have any other brand of receiver, you will need to get the correct TRIAD kit for that receiver. While the core chassis is the same in all kits, some of the additional components such as buffers and takedown lugs are specific to the upper being used.
• 7.62x39 ammo can be finicky in an AR. Some brands have hard primers which require a heavy hammer and stiffer hammer spring to detonate the primer. This is not a TRIAD issue, this is a common issue with this caliber in the AR platform.  If you are running this caliber and having light primer strikes, fail to fire, etc, you will need to replace the RAVE 140 trigger with a heavier Mil-spec trigger that can hit the primers harder. Keep in mind that the trigger needs to be a flat-faced trigger, and it doesn't hurt to add a stiffer hammer spring at the same time. This combo will.