I have a couple AR-15s in 5.56 and don't have this problem (if it is a problem) with my new 6.5 Grendel build.
As you see in the red circle, the guard is all scuffed up after shooting the first 40 rounds at the shooting range. I know its purpose is doing just that (protecting the shooter) but in the hundreds of rounds shot through my ARs in 5.56, none have any markings from ejection.
Should I be concerned? If so, what could be the cause? The AR shot well - no issues at all (other than the subject matter of this post). It's a 20" SS barrel, (Grendal II .136 bolt face) and .750 gas block. I bought the upper complete (and the BCG) from Midstate Firearms (bought from them before - good pricing and customer service). Ammo was Hornady Black Box.
As you see in the red circle, the guard is all scuffed up after shooting the first 40 rounds at the shooting range. I know its purpose is doing just that (protecting the shooter) but in the hundreds of rounds shot through my ARs in 5.56, none have any markings from ejection.
Should I be concerned? If so, what could be the cause? The AR shot well - no issues at all (other than the subject matter of this post). It's a 20" SS barrel, (Grendal II .136 bolt face) and .750 gas block. I bought the upper complete (and the BCG) from Midstate Firearms (bought from them before - good pricing and customer service). Ammo was Hornady Black Box.
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