Originally Posted by
GTifosi
I wouldn't expect the barrel to be in the .750 spec range except right at the point where the gas block mounts.
There is generally a shoulder cut just in front of that area, then from there out to the muzzle is skimmed to a smaller diameter to allow the gas block to slip over it easily.
Doubtful changing from whatever you have to an FN barrel would make any difference unless they have some special thing they do for thier mock dissipators.
A pinned standard sight tower gas block out front would likely be just fine. Set screw mabe not so much.
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