Well the registry will be gone within the next year hopefully sooner but i did call them and they said they didn't care about the extra barrel, its only the frame they cared about, same goes when you buy a 3 barrel set for a shotgun or t/c rifle extra barrels, you don't need to register them, beleive me i called them twice just to make sure the first person wasn't full of sh*&. But since the prices are coming down now i have seen new rifles advertised for $ 260 and shotguns about $ 110 I just buy the complete rifles now, plus i find interchanging barrels a bit of a pain anyway, i like the ease of just picking it out of the safe ready to go.