so i went to the range yesterday and the first round i tried to chamber got hung up on the feeding ramp, I pulled the charging handle back and let it go and it jammed up i pulled it back again and let it go and the round went in, now when i ejected the round (unfired it have marring on the projectile and casing but not too bad) after the round was chambered i was able to fire it with no problem but every once in a while i would have a FTF. Now if i have the bolt lock back and release it i have a round chamber with no problem, the gun was clean and i haven't had this problem before i've put about 800 rounds through it before and only have i FTF. Im thinking about polishing the feed ramp but it looks fine i ran a qtip across the ramps to see if anything was snagging and i didn't see anything that would raise a red flag. Anyone have any thoughts??? thanks