Noticed that my .223 AR-15 is denting and scratching the brass. The neck of the brass gets two scratches one at 11 O'clock and one at 1 O'clock. And the body gets a dent at 12 O'clock (half way from shoulder to rim). Pretty sure this is a feeding issue but people that leave the brass at the range would never notice this. Haven't noticed anything on the bolt or bolt carrier. Does the same an different magazines also. Any suggestion's?