This is a vice block and super safety cutting guide for the Ult AR-57 bolt carrier group. If you want to get your AR-57 bolt to work with the super safety, you can use this vice block to hold your bolt and use the guide to mark your bolt where to cut. You can use a router or a dremmel but be VERY careful if you cut by hand. This is not a modification for inexperienced hobbyists.
LBRY Tags: ar-57; 5.7x28; bolt; vice block
Browner M1915 AR 15 Pistol Conversion Pre Alpha