essentially, OAL determines the legality of using a VFG on an AR-type weapon with no buttstock. If it is under 26" OAL and has a VFG, it is considered an AOW rather than a handgun, as we all know. But, if the weapon is more than 26" OAL and has a VFG, it no longer fits the definition of "handgun" or "pistol", but also doesn't fall into the AOW catagory, and it is not a rifle because it has no buttstock. It becomes simply a "firearm