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.