Currently machining a M4 Government profile barrel for my XE GBB, the real steel measurement start from the breach face to the muzzle crown (tip). Therefore, we have no clue measure the TRUE LENGTH based on the toy guns, the only way "like what noveske did" is to work backward measuring from the tip (or gas block stop) to get the right length. If anyone just use real steel info. for our toys the length must go wrong!
