Yes, the gas block I bought is confirmed by the AR armorer at the lgs and was test fitted on their own barrels. It slid on their middy phospate barrels with no issue or lubrication.
When I was trying to install the gas block at home, I did use a bit of Hoppes9 lube on the inside of the gb with no luck.
Yes it is completely impossible to slip on the barrel without damaging the gas block. And we made sure the pins below the gas block were removed before we tried it. It will slip on the first half of the barrel until it gets right before the gas port then it will get stuck. The gas port section of the barrel is a bit thicker than the front of the barrel towards the muzzle.
For reference, this is the barrel that I bought:
http://store.southerngunsllc.com/ind...product_id=237
If you zoom in on the 2nd pic of the barrel, you will see there is a thicker portion of the barrel before the gas block. This is where it begins to get stuck.
I will try to buy the AO gas block this week and see if that will fit.



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