Dented case mouths

[jcj54]

My 2016 NM AR 5.56x45 badly dents at least 50% of case mouths on ejection.
Any suggestions on how to correct this?

[Letrapes]

An AR of mine was doing the same and I was told by someone to put a piece of sticky backed Velcro on the brass deflector bump. Ended the problem for me as the brass now hits the soft Velcro on the way out.

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[jcj54]

I think it is hitting the barrel extension or ejection port.

[Letrapes]

You should see a deposit of brass where it's hitting after a while. Put something there if possible to soften the hit. Outside of that you might be looking at changing the gas system to alter bolt cycling speed.

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[jcj54]

Heavier Buffer?

[HighpowerRifleBrony]

Velcro on deflector. Trim ejector spring or ejector til it's just proud of the lug face before installing the retaining pin.

[lapriester]

Originally Posted by jcj54

My 2016 NM AR 5.56x45 badly dents at least 50% of case mouths on ejection.
Any suggestions on how to correct this?

Why? Doesn't hurt a thing. Sometimes just a heavier buffer will slow down bolt speed allowing sooner ejection. Otherwise just run a tapered punch into the mouth hefore resizing. Problem solved.

[milprileb]

Sometimes simple is best, the velcro sticky piece works well .

[Jack Leslie]

+1 for Velcro

[lapriester]

If it's bad usually it's because you may need to reduce the tension of the extractor spring or the oring around it is hardened. Often that oring can just be removed without issues.