06-12-2013, 09:40 PM
(This post was last modified: 06-12-2013, 09:49 PM by Keep The Change.)
OK drifter and bwaites made comments about things being square. Drifter more specifically asked about the upper.
This is a LB product so I would continue to send it back to LB and ask about the upper and barrel extension being square and whatever else we can suggest. I'm thinking there is something between the bolt and BE that is off.
If the BE is not square to the upper, could this not angle the BE and barrel just a touch so that one side of the upper flange is flush with the barrel nut flange while leaving a gap on the other side. Remember if it is off a tad at the upper receiver and barrel nut mating surface, it is magnified at the Bolt to BE mating surfaces because of the length of the BE.
Maybe the threads and or face on the upper are not square and causing some added interference in the bolt to BE lock up.
This would give you varying interference between the bolt and BE lugs from one side to the other. You may not see it or feel it when you charge or release bolt catch, but it could be there.
Then couple in the possibility of barrel whip being able to move that BE inside the upper just a bit as the bolt comes forward.
I would suggest that LB check for squareness of receiver to BE. Check squareness of upper rec threads with the barrel axis.
I might be way off but after my experience last week with my BE and Bolt interfering, it doesn't take but 0.002"" to cause issues.
This is a LB product so I would continue to send it back to LB and ask about the upper and barrel extension being square and whatever else we can suggest. I'm thinking there is something between the bolt and BE that is off.
If the BE is not square to the upper, could this not angle the BE and barrel just a touch so that one side of the upper flange is flush with the barrel nut flange while leaving a gap on the other side. Remember if it is off a tad at the upper receiver and barrel nut mating surface, it is magnified at the Bolt to BE mating surfaces because of the length of the BE.
Maybe the threads and or face on the upper are not square and causing some added interference in the bolt to BE lock up.
This would give you varying interference between the bolt and BE lugs from one side to the other. You may not see it or feel it when you charge or release bolt catch, but it could be there.
Then couple in the possibility of barrel whip being able to move that BE inside the upper just a bit as the bolt comes forward.
I would suggest that LB check for squareness of receiver to BE. Check squareness of upper rec threads with the barrel axis.
I might be way off but after my experience last week with my BE and Bolt interfering, it doesn't take but 0.002"" to cause issues.