Springfield Armory is now importing a version of the the VHS-2 bullpup (commercially named the Hellion here in the US) with a 20-inch barrel. This is the barrel length used in the most common military pattern of the rifle, the VHS-2D. In addition, Springfield's semiauto configuration has the proper military muzzle device, barrel rings for the rifle grenade launcher, and a bayonet lug which fits the standard military bayonet for the VHS-2. This is a pretty cool new option for folks who are interested in the Hellion as a copy of a current-service military rifle.

The next thing you will need for a proper clone is a VHS magazine well and some of the proprietary VHS-2 magazines...