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Old March 8, 2010, 07:49 PM   #3
Technosavant
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Join Date: May 29, 2007
Location: St. Louis, MO area
Posts: 3,903
Does the barrel have M4 feed ramps? The upper? If you're using a non-M4 ramped barrel in a M4 ramped upper, the bullet nose is likely to get caught in the resulting pocket.

Otherwise, I'd strongly suspect the ammo.
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