Bought the kit '77 or '78. Fun assembly. Fun shooting. Let it set for 43 years giving no attention at all (shame, shame). Woke up, cleaned it, (really glad I'd cleaned it after last firing). Back then I didn't use a patch or lube. Just put the ball in the barrel and rodded it down. Didn't have any trouble with it rolling out. After so many years the barrel needed inside attention and got it. After cleaning the rear sight it needs to be zeroed. Selling for $285 shipped within the lower 48 states. Don't know the twist. Barrel lenth is near 28" The clean out screw is miss and well be installed before shipping. Ask questions. Thanks, Steve