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Old December 22, 2012, 06:51 AM   #4
Junior Member
Join Date: September 17, 2009
Posts: 7
I have a Colt 6933 factory SBR with an 11.5 inch barrel. I keep it clean and well lubricated, and haven't had any malfunctions yet with approximately 1500 rounds through it. The muzzle blast is noticeably greater than with the 14.5inch upper on it, however.
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