MPX Slip Fit Magwell (SFM™)

Making its return for the MPX from Sig Sauer, we bring you our Slip Fit Magwell (SFM™)

One of the first magwells we ever made, the MPX SFM took queues from our competition proven EPC9 SFM, and was originally developed at the request of select LE end users who were evaluating the MPX platform as a whole. Through department and market changes, it was shelved quietly in early 2022 while we focused on other core launches, but now, with years of refinement and real-world feedback behind it, it’s finally ready for a fully supported public release.

This final version of the MPX SFM delivers notable improvements over it’s predecessor: enhanced funnel contouring (a more generous + blended interior geometry) and a refined exterior form factor, bringing you uncompromised improvements in reload consistency, while maintaining a footprint and durability level suited for everything from duty to competition.

Our tried and true attachment method, co-developed with Darq Industries, embraces simplicity, allowing our magwells to be comprised of only three pieces – the polymer “funnel”/magwell itself, one 4-40 socket head screw, and one threaded insert. This package offers a secure and reliable fit, while also keeping the overall weight right at .55 oz, making it nearly invisible on your weapon system until you utilize the 150%+ increased funnel size – all function, no fluff.

*only compatible with MPX lower receivers. For Aero M4E1/BA Enhanced, please use this variant. For standard forged models, please use this one. For Radian ADAC, please use this one, and for ADM UIC/ADM4, please use this one. If you have any trouble when installing your SFM™ please contact us for assistance.

Please Note:

Due to the efficient attachment method, minimal torque is needed when tightening the screw. Simply tighten the screw until the split section begins to touch, then just shy of a 1/2 turn of the screw for final torquing.