The 600 and 451 are fun to blaze away with but I rather like the early SA6s which I revalved for better Powerlet to valve seal performance..22 Crosman dust can slugs are the food for these old guns!Way back I got Arvo's quick/fancy draw book(published by Daisy for kids using their funny wee BB-knocking pistol). Surprising what he can teach a kid.Just watch Randolph Scott out-draw Lee Marvin in one old flick!