Inception Designs Paintball Autococker Universal IVG Polished Black NEW
The center hole is designed to take a 3/16 allen key and to be used with mid blocked guns or full body guns with a cocking rod without the cocking rod installed, but to make it super easy you can leave the cocking rod in place (it fits through the center hole) and use a 1/8th allen key in one of the outer allen key holes to adjust your spring tension.