Hoping I can get a quick answer here...
Looking at the 14.8" HEDP Fluted barrel, it looks like the step behind the muzzle shoulder could support the Ops Inc (M4) mounting system, which needs the .700x.700 contour/step behind the muzzle shoulder. Does anyone have one of these barrels or know what the actual dimensions are and if this will work?
See pic, area that I'm referring to is circled in red.