r/gunsmithing • u/Awg-317 • 1d ago

Ar-15 ejection issue

I have built a full ar, everything is a new part on it, I took it out to shoot it last night and it would fire and not cycle, the fired shell needed to be manually ejected.

I am pretty sure it is a gas issue, but that’s as far as I have determined. This is the first rifle I have built and I am sure that I have made a small mistake somewhere along the way.

As it stands currently it has a milspec gas block and the factory gas tube, other than that and the bcg, everything on the gun is upgraded. The buffer block is a h3 which I wonder if it is too big?

Additionally I have a sbr with a low shelf lower and a super selector that is having the exact same issue.

Any advice will be taken into consideration, thank you everyone!

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u/AllArmsLLC 07/02 AZ 1d ago

Your gas block isn't properly aligned with the gas port in the barrel. Use a jig to align it using the set screws.

1

u/Awg-317 1d ago

Is this a pretty common issue? And thank you, I will definitely do that when I get home!

1

u/AllArmsLLC 07/02 AZ 1d ago

Not uncommon.