I picked up some chatter that the diameter of the LMT barrel beyond the threads may cause an issue with the Surefire. Anyone heard anything similar or have used the combo and confirms there are no issues?
Yes, If you have an early barrel the outside diameter will be too large to fit into the rear of the Surefire brake. It is easy to spot if you have an early barrel, the barrel is straight in front of the gas block-No step down. If your barrel has a step down in diameter you will see it about 3" behind the shoulder for muzzle threads.
I know that the reduced diameter is needed for the long SF brake like the 762ssal/RE.
I thought that the short version of the brake did not require any reduction in barrel diameter, just the same as a birdcage FH.