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They do and should not be a factor on Full Size 1011's Roger.

yes the do be aware that IMO there are no drop in 1911 parts and please check the lockup or have it checked by a good gunsmith before using after putting in the drop in replacement barrel I carry a scar from a 1911 that came apart because the improper fit of a new drop in barrel I was on the next shooting station when the gun came apart