This is the description of the CVA Mountain Rifle from the 1980 Gun Digest. The oldest ones had a Douglas barrel made in the U.S.. If something doesn't match the description exactly then maybe it's because of the production date. It was sold as a kit and as a finished rifle.
Caliber: .45, .50, .54, .58
Barrel: 32" octagon, 15/16" across flats
Weight: 8 lbs. Length: 48" over-all
Stock: American Maple with cheekpiece
Sights: German silver blade front, screw-adj. rear for e., dovetail.
Features: Available in percussion or flintlock. engraved lock with adjustable sear engagement, hooked breech with 2 barrel tennons, rifled 1 in 66", double set triggers, German silver patchbox, tennon plates, pewter-type nose cap, browned iron furniture.