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Recently, I have read some posts indicating that certain 1911 manufacturers such as Dan Wesson and Ed Brown are using 9mm firing pins in .45acp 1911's. I'm curious as to the reason for this, and whether there are any drawbacks. Any info. would be appreciated. Thanks.
 

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Les Baer does this too.
Probably for sake of uniformity, that is, .38 Super, 9mm and .45ACP guns can all have the same specs for FP, FP spring and for size of FP hole in breechface.

The original 1911 specs call for a larger diameter (and different contour) FP for the .45ACP , but I'm not specifically aware of a downside to using the smaller diameter FP.

I have a Les Baer in .45ACP with the smaller diameter FP, and have never had an ignition failure.

Best.
 

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i beleive the only issue could come if you were using a fp spring that was too soft, and a too strong Mainspring. you may get some punctured primers due to the smaller diameter...but i may be blowing smoke so take it with a grain of salt.
 
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