5:00 ejection sounds like it's might be right on the edge of being under gassed. Why don't you just go back to the standard AR15 bolt carrier.
How did you check the gas system? If your system is bleeding gas off someplace, I'd check the gas rings. I've had gas rings wear out in as little as 500 rounds.
Just don't go monkeying around, like taking weights out of the buffer, trying to cure a symptom. Find the problem. Although I suggested going back to the lighter carrier, your rifle should run with the M16 carrier as well. My guess is that you're bleeding gas someplace.
Without having the rifle in my hands it's hard to say where the leak is. It could be a bad seal between the barrel and block, block and gas tube, gas tube and gas key, gas rings or a combination of all.
How did you check the gas system? If your system is bleeding gas off someplace, I'd check the gas rings. I've had gas rings wear out in as little as 500 rounds.
Just don't go monkeying around, like taking weights out of the buffer, trying to cure a symptom. Find the problem. Although I suggested going back to the lighter carrier, your rifle should run with the M16 carrier as well. My guess is that you're bleeding gas someplace.
Without having the rifle in my hands it's hard to say where the leak is. It could be a bad seal between the barrel and block, block and gas tube, gas tube and gas key, gas rings or a combination of all.