Aero Precision M4E1/BA Enhanced Slip Fit Magwell (SFM™)

The M4E1 Slip Fit Magwell (SFM) brings “extra flare” to your Aero Precision M4E1, M4E1 PRO, and Ballistic Advantage Enhanced receivers, increasing the existing funnel of the receiver by approximately 170%. The unique slip fit attachment method, co-developed with Darq Industries , offers users a simplified one piece construction with reduced points of (potential) failure – it has been proven through years of use on our EPC9, personal M4E1 builds, and Darq’s standard forged lower variants. The hardware follows this simplified approach, consisting of one 4-40 socket head screw and one threaded insert, offering a secure and reliable fit while also keeping the overall weight right at 0.50 oz.