[WilD]

This is mostly covered by the term "bucket changer" but language I have seen several times before describes the requirement for the 12 gram to "pass through the threads" of the changer. I'm not sure if that really adds anything to your description, but its how I've seen it before and may help clarify for people who don't know what a bucket changer is. However, this language seems to exclude stock Nelspots and the Crossman 3357, which are usually allowed in stock class but have the 12 gram under a grip panel. I never understood that part.

I also agree with shartley that pump is a misleading term, as bolt action (Nelspot 007, Sheridan PG, Splatmaster) and the wheel guns (3357, AGA 62) are usually considered stock class markers too.

The Crossman and AGA may be better left out of the disscussion though as they appear to be exceptions to several rules. Maybe I'm just off my rocker and they were never stock class legal.