FAC has extended threaded barrels for Glock pistols, $90. Anyone know if they function properly or if they're crrrap? Now I know all about silencer laws, but having a threaded barrel is just fine, though it's one out of five restricted features on a pistol just like flash hiders, bayo lugs, pistol grips, etc are on rifles. But there are different laws affecting imported rifles from domestic ones, and you presently can't even get an imported rifle that takes double stack mags, much less pistol grips or flash hiders. So would installing a threaded barrel cross the evil line? Or are pistols not under the same laws? HK Mark 23 Socoms seem to be coming in just fine with a threaded barrel, as do the USP tacticals, or am I mistaken?