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Old December 22, 2012, 09:52 PM   #5
plouffedaddy
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Join Date: May 13, 2011
Location: Carolina
Posts: 3,220
The book answer is that it's important. But, I've seen a ton of 3-gun guys put thousands of rounds through their 870s with 3-5 shot extensions (no clamp) without issue.
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