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MAC 10 .45 difference in barrels

DirtyJerry44DirtyJerry44 Member Posts: 124 ✭✭
edited October 2010 in Ask the Experts
Hello All,

I was looking at my MAC receivers and noticed a difference in barrels. One of the barrels has a radius cut into it. The other is flat. I'd like to know why this is.

Please see photo for a better explaination:
mac10-receivers.gif

Thanks!

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