01-11-2018, 02:22 AM
According to Ballistic Advantage tech support they use an .067 gas port on their 16" Hanson barrel.
I recently built an upper with that barrel. Noticed that the gas port looked small when building. BA includes a gas block that is pre-drilled for a pin which I used. After assembling and test firing with a single bullet, the bolt would not lock back all the way. Usually would catch the top of the magazine. Empty cases just kind of dribbled out. Many would be laying a few inches away on the bench. Seems way under-gassed to me. But BA says there have not many problems with them. They have my upper now, so hopefully this will be working soon. I will update if there is any new info from BA regarding gas port sizing.
I recently built an upper with that barrel. Noticed that the gas port looked small when building. BA includes a gas block that is pre-drilled for a pin which I used. After assembling and test firing with a single bullet, the bolt would not lock back all the way. Usually would catch the top of the magazine. Empty cases just kind of dribbled out. Many would be laying a few inches away on the bench. Seems way under-gassed to me. But BA says there have not many problems with them. They have my upper now, so hopefully this will be working soon. I will update if there is any new info from BA regarding gas port sizing.