The all new Battle Steel GUN-JAW is 100% MADE IN USA from the finest materials and is unlike any other gun platform on the market. Self centering mechanism and first of its kind. Build in recoil lugs, grabs a rail based guns 180 degrees. The Battle Steel Gun-Jaw come with six polyurethane rail covers to accommodate all types of firearms. 100% Made In USA, 100% Satisfaction Guaranteed. Specifications/ Features : BODY: CNC machined from a solid block of 6061 aircraft grad aluminum. KNOB: CNC machined from a solid block of 7075 aircraft grad aluminum. BODY & KNOB: TYPE 3 CLASS 2 MIL-A-8625/AMS-A-8625 Hard Anodized. Build-In Picatinny style recoil lugs on walls and base. Comes with two sets of three (3) polyurethane pads for firearms with or without rails. Self centering mechanism, weight centering SCREW: Stainless Steel PH17-4 heat treated to condition H1150 Custom steal Kinserts on all threaded holes. Weight: 16 oz Maximum Open: 2.9" Minimum Open: 1.75" 1/4-20 or 3/8-16 thread attachments. 100% MADE IN USA