The Tac Bolt Release has been designed to operate fully with all VZ receivers whether New Manufacture, Surplus or US made. His part is fully compatible with extended ambidextrous. Ergonomically designed, so it's more suitable even for gloved hand. Completely new made, according to the original manufacturing documentation - including the metal class and hardness. Made of steel, isothermal hardening HR 43-46, finely sanded and surface grinding by hand in every detail. Capture is perpendicular to the Bolt Release ring and ergonomically describes the movement of the index finger for reliable operation.