It doubles as its own guide and is a piece of tool steel welded inside of a tube filled with lead with a tool steel ring welded in place to act as the sear catch. Also the breech slot wascut longer for more stroke.Spring od is .75 and id is .57 and was cut just to the point of being coil bound when latched tothe sear.
Hammer is 85 grams {3oz} and gets 4 shots with 182grain .495" roundballon a 2850psi fill {715, 725, 725 715} or 6 shots at 3000psi {690, 705, 715, 725, 725, 715} With 335grain slugs at 2850psi {575, 580, 580, 575}
Does a real numberon a melon anyway . . .