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Chamber Sizes, Military Or Commercial

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#1 Sgt


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Posted 27 June 2004 - 09:56 AM

You would first want to know if you've got a true military or commercial dimension chamber...different reamers...military is larger diameter.

I wanted to start an new topic about Thompson chambers, and thought I'd use Phil's quote from my other thread. I'm a little confused about military and commercial. Does this mean that some Thompsons out there may have the commercial size? Or, will Thompsons only operate with the military size?

Why are there two sizes; don't they both use the same caliber?
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