I have a Proof AR-10 barrel (carbon fiber) in 6.5 CM, 24 inch length, rifle +2 gas port - with an SLR adjustable gas block. The Proof barrel has a .082 gas port.
Previously this gun had a 22" Ballistic Advantage barrel - and did not have any cycling issues.
With a LANTAC bolt, the Proof Barrel had occasional short-stroke jams, but I just chalked it up to random gas gun failure. I almost exclusively ran 140 grain factory ammi with this set-up.
But I recently upgraded the bolt to the JP Low mass BCG and high pressure bolt designed for the 6.5 Creed. And switched to the 130 grain Berger OTM bullet. With the original standard buffer that I was running with the LANTAC, the JP would not cycle at all - either completely failing to pick up a round or short-stroke jamming. Even with the gas port fully open, it was ejecting at the 5 o'clock. Switched to the JP Silent Capture Spring and it cycled for about 40 rounds and then went back to no cycling. Switched to the lightest weight spring and the 140s now cycle and lock back at empty, but the 130s cycle, but not lock back.
I suspect that this is a function of the Proof smaller port that they "optimized" for the 6.5 Creedmoor? A friends Kreiger has a .095 gas port and does not have this issue at all, running same bolt, but superlative adjustable gas block.
Anyone else run into this issue and solve it somehow??
Previously this gun had a 22" Ballistic Advantage barrel - and did not have any cycling issues.
With a LANTAC bolt, the Proof Barrel had occasional short-stroke jams, but I just chalked it up to random gas gun failure. I almost exclusively ran 140 grain factory ammi with this set-up.
But I recently upgraded the bolt to the JP Low mass BCG and high pressure bolt designed for the 6.5 Creed. And switched to the 130 grain Berger OTM bullet. With the original standard buffer that I was running with the LANTAC, the JP would not cycle at all - either completely failing to pick up a round or short-stroke jamming. Even with the gas port fully open, it was ejecting at the 5 o'clock. Switched to the JP Silent Capture Spring and it cycled for about 40 rounds and then went back to no cycling. Switched to the lightest weight spring and the 140s now cycle and lock back at empty, but the 130s cycle, but not lock back.
I suspect that this is a function of the Proof smaller port that they "optimized" for the 6.5 Creedmoor? A friends Kreiger has a .095 gas port and does not have this issue at all, running same bolt, but superlative adjustable gas block.
Anyone else run into this issue and solve it somehow??