It's likely a partially obstructed gas port...did you try to stick a pipe cleaner or wire or some **** down in the gas block through to the barrel? See if it's plugged. There should be enough gas though...
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lol ^^^^ this is why I love the odt you guys are too funny
mag could be seated to low,
could have a misfeed due to missing or improper ramp on bullet guide or misplacement.......machine a slight guide into the chamber chamfer
HP projectiles,
take out the recoil buffer......it reduces BCG inertia and travel
please report back after step by step starting with the bullet guide and feed path correction. something is causing a tipping up of the round into the receiver.........shouldn't be hard to correct that with proper geometry changes.