Does yours have Made in Spain on the barrel? The earlier ones either have Made in USA or no country of origin, and these are supposedly the more desirable Douglass or Deercreek barrels. If yours is 15/16" across the flats like mine, too small for a 58 barrel I would think. Mine is in the 75,000 serial number range and has the Spanish Maslin lock which is pretty weak. I believe L and R makes a replacement lock for the CVA Mountain rifle, at least in Percussion, and I believe I will go this route for mine when I can afford it.