Bought an H&R with 2 uppers, (yes, an AR reference, sue me) 1 in .223 and another in .308 both varmint barrels. Decided I didn't want to do the whole exchange thing so searched and found another lower. Lucked out, fits nice and tight, and came with a nice set of wood furniture to boot. I wouldn't mind finding a SG barrel, .410, 20 gauge preferred but would take a 12.