Barrel minus the false muzzle is 34.5" long. 8 square bottom lands and grooves, not particularly deep, less than, say, an original 1841 Mississippi. Does not make a complete half turn in 34.5 inches (almost). Perhaps 1:72? (Which would be the same as a Mississippi). Don't have a small enough bore light myself, when I checked with a friends light, I could tell the bore was in good condition, but did not strike me as obviously gain twist (would like to check again when I get a chance).
Looked under the mid sight, no info on the barrel. Considering the Good inletting for the trigger guard and butt plate, thinking the lock is a replacement. Some of the screws, like the lock play screw, is definitely a replacement.