- Modular design for individual personalization
- Multiple lengths available
- Offset extension mounts in 4 different configurations
- Positively locks in both the open and folded position
- 6061 and 7075 construction with Type II low gloss anodized finish
- Can be configured with multiple buttstock variations
A3 Tactical is proud to release our Modular Folding Arm Stock system for the popular SIG line of MPX/MCX firearms. This system is designed from the ground up to provide modularity in style, form, and function. The proven Sig hinge (provided) utilizes a positive spring-lock for both the open and closed position, allowing the user to quickly release the brace from either position.
NOTE: This Modular folder uses the OE Sig hinge. Due to the small offset of the Sig hinge the buttstock rests against the side of the firearm when folded.