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  • Regular price $ 249.95
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  • 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 most buttstocks rest against the side of the firearm when folded.

NOTE: Extension lengths are actual length of the extensions. To calculate overall length, use the following measurements:

-Hinge +7/8"
-Minimalist buttplate + 1/2"
-A3 aluminum buttplate with rubber buttpad + 11/16"
-Polymer buttplate with Magpul buttpad #1 + 1-3/8"
-Polymer buttplate with Magpul buttpad #2 + 1-5/16"