Thread: 45acp subgun?
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Old October 25, 2010, 01:50 AM   #2
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Join Date: July 20, 2008
Location: WA, USA
Posts: 447
I will hazard a guess. The bulge may have been caused by high pressure upon extraction. If the bolt or spring were too light, it is possible that it was extracting too early and causing the bulge.

This is only an educated guess on my part. I'm not sure what the M10's fired brass typically looks like.

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