I have a MK18 (10.3” barrel) pistol, and I know that I can’t put a VFG on it legally. I’ve read that if I use a P&W muzzle device that makes the OAL from the buffer tube to the end of the muzzle device greater than 26” then I can use a VFG. Are there other legal ways to legally use a VFG? For instance, I know a LAW Tactical folder adds LOP, and so does an A5. Do they add enough length (individually or in conjunction) to make a 10.3” barreled upper into a “firearm” that’s greater than 26 inches, or does it not work like that?

I’m not interested in SBRing my lower, even if it were legal in my state (which it isn’t).