By far my best investment has been my AirTex compressor and a good tank from Joe B. I can shoot all I want and never have to think about wasting air. It is a comfort 
Crusher
Crusher
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Just on my Bully, would have to be the bottle clamp picatinny rail, the scope zoom throw lever, and of course, the red trigger shoe. On my Marauder, it would have to be all the Tim Hill parts that makes the gun perform like it does, and on my PRod, the Hill parts, the trigger shoe and the Lee adjustable stock. If I narrowed it to one item, it would be the trigger shoes. Every rifle I own has them.
That scope zoom throw lever is something I haven’t seen before! Might need to add that to my list!