AimShot MTMQR-40PR Quick Release M-Lok Adapter - Picatinny Rail 40mm, Tool free M-Lok quick release for mounting accessories to M-Lok rail sections. 40Mm = ~1.5". Comes with 4 slot picatinny rail that is low profile. Works great to attach most metal accessories to the M-Lok rails. Some plastic accessories (Vertical Fore Grips typically) need more height and work better on the AimShot 140mm length QR. Tool free mounting on M-Lok rails - squeeze the side buttons and place mount into M-Lok slot. Release buttons to fix in place. Press down on the mount to secure the mount in place and take up any slack. To remove - squeeze buttons on the sides and pull away from rail. Both buttons must be pushed to release the mount. NEW larger buttons make it easier to mount and remove quick detach from rails.