Built to fit. Built here.
Stocks, braces, and modular accessories — Designed, tested, and manufactured in the USA. Compatible with H&K, B&T, Sig, Stribog, Springfield Kuna, and 25+ more.
Convert. Compact. Run.
Compatible with Foxtrot Mike, BRN-180, and PSA Jakl uppers.
Built around a mil-spec AR lower — the Triad modular bullpup chassis is engineered to fit function, modularity, and compactness into a single platform.
Find what fits.
Accessories engineered for the platforms our customers run most — and 16 more covered in detail.
A3 x Haga Defense
One stock. Dozens of platforms.
Engineered in collaboration with Haga Defense for strength, aesthetics, and platform-agnostic adaptability.
Built for dozens of firearm platforms, the HDA3 brings strength, clean lines, and modular versatility to your setup. Developed by Haga Defense and A3 Industries, every HDA3 is designed, manufactured, and assembled in the USA. Explore the lineup and find the stock or brace that brings your build together.
A hand-curated selection
of the current lineup.
Modular Folding Brace - Picatinny Mount (1913)
Universal fit
Modular Telescoping Stock - Universal Picatinny (1913) Mount
Universal fit
CR123A Rail Mounted Battery Capsule
Universal fit
Forward Offset Light Mount | M-LOK
Modular Rail Riser And Carry Handle
Universal fit
Versa Stock | 1913 Mount Folding Stock
Universal fit
PFS-X | 1913 Mount Folding Stock
Universal fit
XENO M-LOK Rail Panels (4-Pack)
Universal fit
Why we're built different.
Innovative designs, premium materials, excellent workmanship — built and tested in the USA by people who shoot.
Modular Systems
Adapter-driven design. One chassis, many platforms. Swap, don't replace.
Precision Manufacturing
Tight tolerances. Real-world fitment. Built to last beyond the warranty.
Premium Materials
Billet aluminum, mil-spec polymers, and finishes that earn their keep.
Built Here, By Shooters
Designed, tested, and manufactured in the USA. We are shooters, just like most of you.