Will the Lyman Great Plains Barrels work in the older CVA Mt.Rifles? I know the lock would have to be modified for the patten breach since CVA uses a drum and nipple but other then that will the lugs for the keys line up and what about the rib under the barrel where the thimbles go, will it be proper length or will I have to cut it a bit. Anyway, thanks for any help ya'll can give me. :hmm: