The TRIAD bullpup chassis for the BRN-180 upper receiver Rifle is a meticulously engineered platform designed to enhance the performance and ergonomics of your firearm. Crafted with precision, this chassis features a robust 6061 aluminum front trigger housing and receiver, ensuring durability and reliability in demanding conditions. The front trigger is constructed from 17-4 stainless steel using metal injection molding (MIM) and is treated with a QPQ coating for enhanced wear resistance. The chassis incorporates 4140 steel anti-walk trigger pins, providing stability and security during operation. The A3 Tactical ambidextrous selector, complete with a detent spring and detent, offers seamless control for both left and right-handed users. The front trigger linkage, also made from 17-4 stainless steel with QPQ coating, ensures smooth and consistent trigger pull. For optimal performance, the chassis includes a 7075 aluminum transfer bar and rear linkage, supported by 841 oil-embedded bronze bushings. The Acetal Delrin guide and trigger actuator contribute to the chassis's precision and responsiveness. The main chassis housing is constructed from 30% fiber-reinforced injection molded Zytel polymer, providing a lightweight yet sturdy foundation. The rifle-specific features include a 1.5 inches extended butt-plate made from 30% fiber-reinforced injection molded material, a 6061 rear threaded buffer adapter and a 6061 rear butt-plate. The injection molded elastomer butt-pad and cheek rest ensure comfort during extended use. The chassis is equipped with multiple 4140 quick disconnect (QD) sockets for versatile sling attachment options. The mag release system is enhanced with a 4140 steel mag release, a 7075 extended right-side mag release button and a 7075 left-sided mag release lever for efficient magazine changes. Additional features include an injection molded Zytel polymer front trigger housing cap, a rear butt-plate support and a rear cap with a 4140 quick disconnect sling socket for the pistol configuration. The 4140 ball detent takedown pins ensure secure assembly and disassembly. The A3T XENO-patterned reduced angle polymer grip, made from 30% fiber-reinforced Zytel, offers ergonomic handling. The chassis is completed with the rise armament RAVE 140 drop-in trigger, providing a crisp and reliable trigger pull. Please note, this is a chassis system and not a lower receiver. A compatible lower receiver is required for complete assembly.

6061 aluminum front trigger housing/receiver
17-4 stainless steel Metal injection molded (MIM) front trigger with quench-polish-quench (QPQ) coating
(3) 4140 steel anti-walk trigger pins
A3 tactical ambidextrous selector with detent spring and detent
17-4 stainless steel front trigger linkage with QPQ coating
7075 aluminum transfer bar and rear linkage, equipped with 841 oil-embedded bronze bushings
Acetal delrin guide and trigger actuator
Main chassis housing composed of 30% fiber-reinforced, injection molded Zytel polymer
30% fiber-reinforced, injection molded, 1.50 inches extended butt plate
Threaded chassis inserts made from 4140 steel and 7075 aluminum
6061 rear threaded buffer adapter
6061 rear butt plate
Injection molded elastomer butt pad and cheek rest
(2) 4140 quick-disconnect (QD) sockets
4140 steel magazine release
Extended right-side magazine release button for 7075 model
7075 left side magazine release lever
Front trigger housing cap made from injection molded Zytel polymer
Rear butt plate support composed of 30% fiber-reinforced, injection molded Zytel polymer
(3) 4140 ball detent takedown pins
A3T Xeno-patterned reduced-angle polymer grip
30% fiber-reinforced Zytel by RISE armament
RAVE 140 drop-in trigger

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