Breakthrough Clean Lower Vise Block Features The Breakthrough Clean Lower Vise Block inserts directly into the AR-15 magwell and locks in place using the rifle s own magazine catch creating a snug secure hold without the need for a proprietary clamp adapter. Once seated the block clamps into any standard bench vise giving the shooter a stable platform for detailed cleaning parts swaps or trigger work without the rifle shifting or marring the receiver. An integrated hammer stop tool safely permits dry firing during maintenance checks without the hammer striking and damaging the receiver. This combination of features makes the block useful well beyond simple cleaning tasks. An included Pivot Lock works alongside the vise block to hold the rifle open at the desired angle giving convenient access to the barrel and chamber for bore cleaning and inspection. To engage the magazine lock safely the hammer stop must be removed or the bolt locked back first and the bolt should never be closed with the hammer stop inserted a straightforward safety step covered in the included instructions. The block s design accommodates any standard AR-15 lower receiver. This tool is a durable addition to any home workbench or armorer s cleaning station. Breakthrough Clean Lower Vise Block Specifications Brand: Breakthrough Clean Model: Lower Vise Block Compatible Hosts: AR-15 Color: Green / Black Mount Type: Clamp Features: Pivot Lock Integrated Hammer Stop Available At: GrabAGun