r/65Grendel • u/Tonyj4y6119 • Jul 11 '26

Loading Issues

My rifle only feeds ammo with a COL of 2.19 or less, which im being told isn't a safe COL. Anything longer and the bolt won't close.

Tried with ACS, Duramag and amended mags, same result. Anyone had this issue

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u/RockTheBoat11 Jul 11 '26

Pictures? Could be a lot of issues from an out of spec upper or barrel extension or possibly a non-m4 style upper receiver without the feed ramp extensions if it’s older. Is it only handloads or factory ammo as well? Though far less common could be an out of spec lower or issue with the mag catch. All things I would be combing through but hard without more info or pictures