a few questions about the S&W Military and Police .45acp compact....

a few questions about the S&W Military and Police .45acp compact.... I'm going to get a new(new in box) Smith and Wesson M&P .45acp compact soon & had a few gunsmith/after market concerns...
1) can the S&W Performance Center or a S&W trained armorer add a ambi safety to a compact M&P .45acp? This model doesn't have it & I think S&W no longer sells a ambi safety compact in .45acp.
2) do any places like Bar Sto or KKM make match grade stainless barrels for a compact .45acp pistol?
3) do full size M&P .45acp pistol magazines fit the smaller compact .45acp in emergencies?
It could be useful as a BUG or back-up on security details.

PM if you want.

Thanks,
ClydeFrog

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