The TRIAD bullpup chassis for the BRN-180 upper receiver Pistol is a meticulously engineered platform designed to enhance the performance and ergonomics of your firearm. Crafted with precision, this chassis features a robust construction using high-quality materials such as 6061 aluminum for the front trigger housing and receiver and 17-4 stainless steel for the front trigger, both treated with QPQ coating for superior durability and corrosion resistance. The chassis incorporates 4140 steel anti-walk trigger pins and an A3 Tactical ambidextrous selector with a detent spring and detent, ensuring reliable and smooth operation. The front trigger linkage is also made from 17-4 stainless steel with QPQ coating, while the transfer bar and rear linkage are crafted from 7075 aluminum, enhanced with 841 oil-embedded bronze bushings for seamless movement. The main chassis housing is constructed from 30% fiber-reinforced injection molded Zytel polymer, providing a lightweight yet sturdy framework. For rifle configurations, the chassis includes a 1.5 inches extended butt-plate and an injection molded elastomer butt-pad and cheek rest for added comfort and stability. Threaded chassis inserts made from 4140 steel and 7075 aluminum, along with a 6061 rear threaded buffer adapter, ensure secure attachment and compatibility with various components. The chassis also features multiple quick disconnect (QD) sockets for versatile sling attachment options. The TRIAD bullpup chassis is equipped 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. The front trigger housing cap and rear butt-plate support are made from injection molded Zytel polymer, enhancing the chassis's resilience. Designed for both pistol and rifle configurations, the chassis includes specific components such as a rear cap with a 4140 quick disconnect sling socket for pistols and additional QD sockets for rifles. The A3T XENO-patterned reduced angle polymer grip, made from 30% fiber-reinforced Zytel, offers ergonomic handling, while the rise armament RAVE 140 drop-in trigger provides a crisp and responsive trigger pull. Please note that 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
Threaded chassis inserts made from 4140 steel and 7075 aluminum
6061 rear threaded buffer adapter
(3) 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
Injection molded Zytel polymer rear cap with a 4140 quick-disconnect sling socket
(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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