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Thread: Barrel Extension and Upper fit
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26 September 2012, 10:49 #1
Barrel Extension and Upper fit
We get this question asked a lot so I'd thought I'd post a picture provided by AR15Barrels.com. The key is as the bullet is traveling up from the magazine, you don't want it to hang. Even in this picture where the M4 extension and upper receiver meet (top right), you can see where the bullet can hang. You can take a small file or dremel (very carefully) to make that area perfect.