It looks like most of the BCM Gov't profile barrels are slightly tapered right before the muzzle threads.
Would this work, or does it still need re-profiled?
And if it does need re-profiled, does the gas block need to be removed? If I go with a BCM upper with a DD rail, will the pinned low pro gas block have to be removed and reattached?
12.5"
Im looking at a BCM 12.5" and mounting an M4-M
It looks like the longest rail I could use would be 10"
One more question, will the M4-M or M4-S work with an 11.5" with shaved FSB. After the bayo lug is cut off is there enough room for the collar, or is the FSB too far forward on an 11.5"
Or would you recommend I get the 12.5 and have you cut to 12" or 11.5" and re-thread (to make sure threads are correct) if there is enough room before the fsb?
11.5"