Who makes your AR? The ramps are fine since they are machined into the barrel extension. If the upper receiver was milled incorrectly then that is what you are seeing. This should have no effect on feeding since the rounds only ride up on the barrel extension and not the upper receiver. I would be interested to know who manufactured your AR, because if it's not just a poor camera angle, than it's poor QC. If you are worried about it feeding, load up a magazine and manually cycle them through the action (keeping your finger off the trigger of course)
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Last edited by RL357Mag; 07-12-2009 at 01:55 AM.