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Posted: 11/13/2008 11:08:44 AM EDT
| I'm putting together a 20" upper for my M&P 15R (5.45x39) that will be chambered in 5.56. The current upper has a 16" barrel with a carbine gas system. When I make the switch to the 20" standard gas system upper, do I need to make any changes in the buffer tube? |
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