Our M-LOK B1 Handstop is designed to give you better control through a more ergonomic grip angle while not adding bulk to the front of your rifle or pistol. – Technical Specs – Low profile ergonomic fit. – Weight: 1.15 oz – Size: 2.38 x 1.15 x 0.90 – M-LOK is a modular locking accessory mounting system developed by MAGPUL. – Adjusts in 1/2 slot increments for precise accessory placement. – No access to back side of the rail is required. – Accessories can mount with either end facing forward. – Works with both metal and polymer accessories.