Originally Posted by cb4017

Just an update. The low profile gas block I used was a YHM clamp-on. There was very little clearance between the bottom of the gas block and the inside of the rifle length Troy TRX. There was contact between the gas block and hand guard with upward pressure on the hand guard.

I replaced the YHM gas block with a VLTOR clamp-on gas block. Much more clearance and the problem is solved.