Thanks to all whove replied. Ill try the Loctite, and keep an eye on it.

Seeing a B-SS in an early 70s Browning catalogue as a child was my first glimpse of a side-by-side.... Elmer Fudds ever-present double excepted. Ive had a bee in my bonnet for juxtaposeds in general and the B-SS specifically ever since. Glad I finally have one. The pin-drift issue aside, its been as reliable as a brick for the few hundred shells Ive put through it so far. And the coach at the trap & skeet club said it seems to fit me well. I enjoy busting porcelain frisbees with it. Feels right. When Im doing it properly, it feels transparent.