Keep the rig clean, including using a chamber brush by hand on the chamber, the upper bearing areas lubed on the wetter side with CLP, and let the rifle break in for a few hundred rounds for all the parts to mate.
Then go back and retry the ammo again.  


At that point, if you want to pull the gas block, there should be a good fouling mark where the gas block passage was placed against the barrel gas port, and if the burn mark is not centered around the barrel gas port mark, then you know that the gas block was not placed correctly on the barrel (against the barrel gas port).
Note: not only can the placement be off side to side (rotation), but front to back as well.  If a gas block was meant to use a forward hand guard end cap, and the float tube does not use such, then the Block needs to be off the barrel shoulder the amount that the cap thickness was.