AimShot Quick Release KeyMod Picatinny Rail Adapter. 60mm = 2 1/4". Comes with 6 slot picatinny rail that is low profile. Works great to attach most metal accessories to the KeyMod rails. Some plastic accessories (Vertical Fore Grips typically) need more height and work better on the 140mm length QR. Tool free mounting on KeyMod rails- press down onto KeyMod holes and slide towards muzzle to lock in place. Squeeze buttons on the sides and slide towards receiver to unlock. Solid "click" is heard when it's locked in place. Adjustable bottom screws to fit most thicknesses of metal rail systems (cerakote anodized etc). NEW larger buttons make it easier to mount and remove quick detach from rails. Specifications for AimShot Quick Release KeyMod Picatinny Rail Adapter: Manufacturer: AimShot Color: Black Length: 61 mm Height: 17.4 mm Weight: 1.25 oz Mount Type: KeyMod Package Contents: AimShot Quick Release KeyMod Picatinny Rail Adapter Quick Release KeyMod Adapter - Picatinny Rail. The first KeyMod quick release mount on the market. Utilizing 2 alignment pins and a locking cylinder these mounts are designed for the abuse. Attaches and releases to the rail with 2 simple quick release buttons allowing for easy on/off without sacrificing mount retention.