This seems like a silly problem to have given that we're not talking about rocket surgery, but here I am....
The rifle is a Bushmaster ORC. I changed out the furniture for Magpul, but other than that the rifle is stock. My ammo of choice is American Eagle 55gr .223.
I got a Superlative Arms gas block for Christmas. I heard nothing but good things when they were produced under Syrac, so that's what I asked for. Yesterday was my first chance to tune it and I'm running into issues.
Their included instructions are reverse from most of what I see in online circles. Rather than work up from full closed they recommend working down from full open. So that's the procedure I followed.
I fired my shot, bolt locked, so I closed it half a turn (two clicks) per the directions. I repeated until the bolt didn't lock back. Normal.
I opened it two clicks from there, to the last "bolt lock" position and it didn't lock back. I opened it another two, and it didn't lock back. I was almost full open before I got out to lock again. When it locked I repeated and started to close it. The bolt continued to lock PAST where I was when it failed to lock the first time.
When it failed to lock I started to open it. Two clicks, still no lock. Two more clicks, still no lock. And another two....
When I got back to a lock position I started to close it again. Two clicks and it locked. Two clicks and it locked. Again, I ended up PAST where I was before it failed to lock.
I just can't seem to get repeatable results. I know there will be pressure differences between rounds, but I would think it should be pretty repeatable, within a half turn, of locking and not locking.
I stripped the upper and I'm not feeling any interference between the bolt carrier and gas tube. I pulled the charging handle and the bolt does lock on an empty mag that way.
At ALL positions (i never got to full closed), whether the bolt locked or not, the rifle ejected the casing. I can tell the gas block is doing something because the ejection pattern changed throughout.
Almost a full box of ammo in and I just can't seem to get it tuned for minimum gas AND get that bolt to lock.
Is there something simple I'm missing?
The rifle is a Bushmaster ORC. I changed out the furniture for Magpul, but other than that the rifle is stock. My ammo of choice is American Eagle 55gr .223.
I got a Superlative Arms gas block for Christmas. I heard nothing but good things when they were produced under Syrac, so that's what I asked for. Yesterday was my first chance to tune it and I'm running into issues.
Their included instructions are reverse from most of what I see in online circles. Rather than work up from full closed they recommend working down from full open. So that's the procedure I followed.
I fired my shot, bolt locked, so I closed it half a turn (two clicks) per the directions. I repeated until the bolt didn't lock back. Normal.
I opened it two clicks from there, to the last "bolt lock" position and it didn't lock back. I opened it another two, and it didn't lock back. I was almost full open before I got out to lock again. When it locked I repeated and started to close it. The bolt continued to lock PAST where I was when it failed to lock the first time.
When it failed to lock I started to open it. Two clicks, still no lock. Two more clicks, still no lock. And another two....
When I got back to a lock position I started to close it again. Two clicks and it locked. Two clicks and it locked. Again, I ended up PAST where I was before it failed to lock.
I just can't seem to get repeatable results. I know there will be pressure differences between rounds, but I would think it should be pretty repeatable, within a half turn, of locking and not locking.
I stripped the upper and I'm not feeling any interference between the bolt carrier and gas tube. I pulled the charging handle and the bolt does lock on an empty mag that way.
At ALL positions (i never got to full closed), whether the bolt locked or not, the rifle ejected the casing. I can tell the gas block is doing something because the ejection pattern changed throughout.
Almost a full box of ammo in and I just can't seem to get it tuned for minimum gas AND get that bolt to lock.
Is there something simple I'm missing?