Standard Forged Slip Fit Magwell (SFM™)

The proven Slip Fit Magwell (SFM™) for your standard forged lowers

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.

*works with most standard forged sets. If yours isn’t a standard forged it likely will not work. We have personally tested fitment on Geissele Super Duty Lowers, Spikes, Anderson, Aero Precision AR15, and Diamondback, with end users running them on numerous additional platforms as well. Due to tolerance stacking across batches of magwells, and differing manufacturer specs, some fitments may be tighter or looser than others – if you encounter any trouble when installing your SFM™ please contact us for assistance.

For Aero M4E1/BA Enhanced, please use this variant. For Radian ADAC, please use this one. ADM, Griffin, LMT and other models are in the works, so keep an eye out if you run their lowers!

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. DO NOT OVERTORQUE

For Cerakote variants (FDE and ODG), the high temps used in the coating process causes warpage on the polymer that is evident while not installed on a lower (the split point gap is increased as the long arms of the magwell “wishbone”). This is normal and does not effect function or installation other than having to squeeze the split point together with marginally increased force. Thank you!