The Faxon Firearms .308 Winchester Big Gunner Rifle Barrel can be purchased with a Mid-length gas system that would require a Mid-length gas tube (MPN:10A810M16NGQ). Or can be purchased with a Rifle-length gas system that would require a Rifle-length gas tube (MPN:10A810R18NGQ and MPN:10A810R20NGQ).
The Faxon Firearms .308 Winchester Big Gunner Rifle Barrel is offered in both a rifle length or mid length gas system. Any rifle or mid length gas system would work as intended with these barrels.
Yes, these barrels are compatible with any DPMS Gen 1 spec bolt or BCG.
Yes it should be able to handle it.
No, the barrel does not come pre-dimpled.
The barrel extension is LR-308 (DPMS Compatible), they will be compatible with the PSA Gen 2 uppers. In regards to bolts, they should have appropriate head spacing for PSA, but they will not be matched specifically because that is only done specifically by the manufacturer if both parts are from the same manufacturer.