@mac86951
Went ahead and verified that all my mags would lock the bolt back, figured this wasn’t the issue since they run fin in other guns I have access too.
#2 My issue was that with the adjustable block it would eject the spent case to about my 4 o’clock, but still would not pick up the next round or lock back on an empty mag.
I have put a non-adjustable block on because I was hearing from other sites that +2” gas sometimes doesn’t like adjustable blocks. However this has not fixed my issue, it now stove pipes if there is another round in the mag. It still ejects on an empty mag but it also still doesn’t lock open after firing.
@carlsbad
Mad sure of that, I’m a rookie to the large frame AR world but I’m not that new
Good that the mags lock back, that eliminates the most often overlooked issue of bolt catch problems.
Bolt carrier and gas to rings are next. My 6.5 Creed had a very poorly staked gas key that loosened enough for cycling problems. I didn't know it until I put a wrench in the screws (I think 55-58in lbs is the torque-spec) and lots of info online how to re-stake if needed. The indication I've learned to look for is excessive powder residue on bolt carrier which is hard to describe. Be sure to check though. Gas rings as well. Sounds like you have some experience. Same way you check for gas ring wear on the 15 platform. If you're the least bit curious, just put a thin costing of clp on them and see if it runs better for a few shots.
Check the bottom of your bolt carrier. Some lowers are poorly drilled in that the FCG may be located closer to the bolt and may be dragging on the bottom of the bolt carrier. Light hammer drag marks should be ok; bolt catch drag marks would be bad.
Since you've mentioned your brass like up at 4'oclock, but doesn't pick up the next round; I doubt any big issue, but the small things add up. Check the above items.
In order to set an adjustable gas block (same for 10 and 15); load one round into a mag and fire. Open gas block until bolt locks back (empty mag). What you've described above sounds as though you need to open the gas block one or two more clicks.
If your gas block is already full open; please remove it and look at your gas port in barrel and the gas port in the block. You'll see powder residue remarking the alignment. Most common items: bad seal at the barrel (gas block not tight, or poor fit) or poor alignment of gas port. Usually that's either a canted block, or a barrel cut for no delta ring and a gas block cut for a delta ring (axial misalignment). I'm guessing this is a set-screw gas block, does your barrel have detents drilled for the block?
Finally; I better ask since diagnosing remotely, you do have a +2" gas tube right? I'm sorry I have to ask, but I'm sure you understand the detailed diagnosis that can happen when the problem is really far simpler.
Figure out what gas block setting gets you empty mag lock back consistently. Try all your mags again.
Next possibility; Adjustable gas blocks with detented "clicks" are not all equal. Alignment may be the issue, you did include a "normal" gas block in your testing; also possible that your barrel has a +2" port drilled with carbine port size. When you you take the havegas block off, do a numbered drill bit set? Use the shanks and see which drill number fits your gas port. #42 / #43 would be what I expect.
Big picture; gas comes from firing. A direct impingement system needs a certain amount of pressure and volume. Either your gas system is "leaking" somewhere; some part of the system needs excessive force; or not enough gas is bleeding off at the port.
Ammo could also be an issue. In specific the dwell time. Most +2" barrels are 24" or more in length. A 22" may be marginal for the 6creed. Not much you'd want to do to slow the bullet down to increase dwell time, but a slower powder would increase the port pressure. A muzzle break, a supressor, and I've heard that even a bloop tube can affect the port pressure.
