Hey guys new here to the site. So I recently got 500 rnds of frontier 55 grn 5.56 . First Time with this ammo . Was shooting Winchester 55grn . Out of 70 rnds I had 5 rnds that got bent by bolt, like they didn’t camber right. No issues with my gun and the Winchester ammo ever before. Just clean the gun a day before shooting. Just trying to figure out if it’s a bolt,gas or ammo issue. Thanks


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