Originally Posted by
Colt Carson
I have a 16” carbine-length gas AR15, and wanted to add a mid-length gun. The carbine-length has been 100% reliable. The new 16” mid-length is short-stroking with top quality .223 69 grain ammunition. Sometimes it won’t lock back on last round, sometimes it won’t grab next round and fails to feed. It ejects at 4 o’clock or so. I haven’t done much troubleshooting, as I was kind of disgusted with it. I realize mine is an uncommon case, but these mid-lengths don’t look so attractive now. I have tried several different magazines and ammunition (.223).
You likely have a gas leak. Either the gas block is misaligned or the gas key is loose. There are other possibilities, but that's where I'd start.
What brand of mid-length is it?
“You have made us for yourself, O Lord, and our heart is restless until it rests in you.” -Augustine
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