Self explanatory. Couldnt find a good working mag release design so i fabricated one. This design is the only printable design i know of that allows for proper installation to milspec tolerances while still giving a sturdy extension interface. Fit should be very snug to properly interface and provide structural rigidity. Welcome to any remixes/ tweaks that may improve the interface between the Extension and the Mag release. Releasing larger extended paddles shortly for smaller hands.