A3 Triad Bullpup Chassis – Polymer

Triad Bullpup Chassis – Polymer

The TRIAD Modular Bullpup Chassis is designed to house a standard Mil-spec AR receiver internally. Using a bufferless upper receiver, it converts your traditional AR into a Bullpup configuration. It is important to understand the details of each configuration, as well as the legalities, before purchasing your TRIAD chassis and/or accompanying parts.

PLEASE READ BEFORE ORDERING- This KIT is the main body and trigger housing only. Each brand of receiver has different requirements and will require a specific installation kit to complete your TRIAD.

Bullpup Advantages:

• Compact Design: Maintains barrel length while reducing overall size, improving maneuverability and concealability, especially in tight spaces like CQC scenarios.
• Improved Balance & Control: Center of mass is closer to the shooter’s core, enhancing handling, stability, and comfort during movement.
• Reduced Muzzle Rise: Shorter action-to-butt plate distance directs recoil more efficiently into the shoulder, minimizing leverage-induced muzzle climb.

 

Compatible Upper Receivers

Model	Calibers	Barrel Lengths	Notes
Foxtrot Mike FM-15	5.56, 300BLK	5.56: 9.00″, 12.50″, 16.00″	Requires Foxtrot Mike Triad Installation Kit
Palmetto State Armory Jak’l	5.56, 300BLK	5.56: 10.50″, 13.70″, 16.00″300BLK: 8.50″	Requires PSA Jak’l Triad Installation Kit
Brownells BRN-180	5.56, 300BLK, 7.62×39	5.56: 16.00″, 18.50″300BLK: 10.00″7.62×39: 10.50″, 16.00″	Requires Brownells BRN-180 Triad Installation Kit
Matador Arms MAT-9	9mm	9mm: 7.825″	Requires magwell conversion insert for Glock or Colt magazine, or MEAN ARMS ENDOMAG
CMMG Dissent	9mm, 5.56, 300BLK, 6.5 Grendel, 6mm ARC, 350 Legend	All barrel lengths **except** 6.5″	7.62×39 **NOT** compatible due to use of AK magazines
Faxon ARAK	5.56×39, 7.62×39	All sizes available	Requires Faxon ARAK Triad Installation Kit

WHAT ELSE DO I NEED TO MAKE A COMPLETE TRIAD FIREARM? You will need a Mil-spec AR lower receiver, an AR bolt catch, a straight-faced AR trigger, and your choice of bufferless upper receiver along with the correct Installation kit.

Specifications:

• Front Trigger Housing/Receiver: 6061 Aluminum
• Front Trigger: 7075 Aluminum
• Anti-Walk Trigger Pins: 4140 Steel (x3)
• Ambi Selector: A3 with Detent Spring & Detent
• Front Trigger Linkage: 17-4 Stainless with QPQ Coating
• Transfer Bar & Rear Linkage: 7075 Aluminum, bushed with 841 Oil-Embedded Bronze Bushings
• Guide & Trigger Actuator: Acetal Delrin
• Main Chassis Housing: 30% Glass-Reinforced Injection-Molded Zytel Polymer
• Threaded Chassis Inserts: 4140 Steel & 7075 Aluminum
• Quick-Disconnect (QD) Sockets: 4140 Steel – x2 on rifle, x3 on pistol
• Magazine Release: 4140 Steel
• Extended Right-Side Mag Release Button: 7075 Aluminum
• Left-Side Mag Release Lever: 7075 Aluminum
• Ball Detent Takedown Pins: 4140 Steel (x3)
• Grip: A3 XENO-Patterned Reduced Angle Polymer