Both hand loads and factory loads. Both will only cycle two, sometimes 3 rounds. I loaded per Lyman book for the powder used. I used H-110 powder. Also used the carbine chart.
Ok on the .750". Wasn't thinking. You are right. All the adjustable gas block will do is restrict rather than open it up.
I have read that the Lyman reloading book is a little conservative. I am also loading light and will work up. However, the factory loads do the same thing. I've also changed magazines, both steel and Magpul. Same results. The gas block is pinned in place, so it can't really be off. Gas tube only pins a certain way also. It does cycle the first round, but after than no. I've never seen this before on any of my other AR's.
