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M1921 Colt Trigger frame ID


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I am try to determine if a 4 digit trigger frame is a Colt. All I have

is pictures (which are not that clear). Two questions -

 

1) Were Colt trigger frames marked "SEMI-AUTOMATIC" or "SINGLE"

or both?

 

2) Does the T-slot for the magazine have rounded corners? Or square

corners?

 

Thanks

 

Bob

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1. Both. Early guns were marked SEMI-AUTOMATIC; later guns marked SINGLE.

 

2. Rounded corners. West Hurley frames have a squared magazine slot. I believe the M1 Thompsons have squared slots as well.

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