I see your problem, it is an AR. 
He is doing it wrong. Sword in right hand, gun in left. Make them duck the sword and shoot them in the top of their head.
It time for a trigger group or new buffer and buffer spring. My guess is change the trigger group to a drop in.
Could be as simple as buffer tube one turn out reducing spring pressure. Even a new spring won't help.
A common problem is putting in hammer spring backwards. misfires, reduces trigger pull sounds good but it's not, reduces hammer striking ability, can lead to full auto scenario.
I would suggest garbage in locking lug area or junk in firing pin hole, but you said upper works on other lower. which rules those out.
One other is you need a heavier buffer because your getting bolt bounce.
A common problem is putting in hammer spring backwards. misfires, reduces trigger pull sounds good but it's not, reduces hammer striking ability, can lead to full auto scenario.
I would suggest garbage in locking lug area or junk in firing pin hole, but you said upper works on other lower. which rules those out.
One other is you need a heavier buffer because your getting bolt bounce.
Standard 3oz buffer and I plan on swapping the spring
I am not beyond making such an error, but doubt I would have done it over and over as many times as I swapped trigger groups around. I am leaning towards not being fully in battery at the moment.
If you lived closer. i have a lot of mil spec trigger group parts pilling up. i thing i even have buffer spring and buffer.
I was an AK guy for a long time then I got some more money and became a PTR91 type guy. I do have Ar15s and AR10s but still prefer the PTR especially after the trigger job.I see your problem, it is an AR.
If you didn’t catch the tongue in cheek, my apologies. I was pointing towards myself.
It’s more than likely the buffer/spring.
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