You try to use 14.5" and cut 1.5" off and see what it looks like. No need to argue because I have done it. It is 12.5".
From MM:
"Vltor Weapons Systems debuted their new M4K upper at the 2007 SHOT show. It's built on a Vltor VIS-1, carbine length Bi-lithic upper receiver. The M4K enables an M203 to be mounted on a shorter barrel than an M4, resulting in a more compact package when maneuverability and compactness is a priority. It accomplishes that with a modified M4 barrel, and proprietary flash hider. Also shown is the new Vltor gas block with integral front sight. Photos were supplied by Vltor.
Receiver - VIS-1carbine length Bi-lithic upper receiver.
Barrel - The M4K barrel is a chrome-lined M4 barrel, shortened to approx 12.5". It uses a carbine-length gas system. The extra barrel length past the gas block adds reliability over a shorty of 10.3" or 11.5".
Vltor M4K Comp/Flash hider - The M4K flash hider incorporates the M203 barrel clamp/mount shoulder needed to attach the M203 to the weapon. Why not just cut the barrel forward of that shoulder? Vltor designed the M4K hider to be compatible with hider-mounted supressors like the HALO, which attach over the hider and tighten by butting up against the rear of the hider. If a crush washer is used, the supressor can be misaligned when tightened, as it doesn't have a nice shoulder to index against. By incorporating the M203 shoulder into the rear of the flash hider body, the crush washer/hider interface is eliminated, providing a good surface for supressor mounting. A blank-firing adapter groove is also included. The flash hider has five dual ports, and is non-indexing. Vltor will also offer a version without the M203 shoulder, as a direct replacement for the standard hider." 作者: McDull 時間: 10-11-2009 10:25
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! 作者: Hkpolice-Psu 時間: 10-11-2009 16:32