I do not understand. AC is not equivalent to 1977?
AC is the equivalent to 1977. But it should be shown in a square anywhere on the frame or barrel, like these:
1975, 1976 and 1989... source the sourceful WWW....
it is possible that my revolver was not initially manufactured as LEP, because all the pieces are the same in the fire version. The only LEP pieces are the cylinder and the barrel. These two pieces can be easily replaced. Maybe the frame of my revolver belonged to a firearm in 1977.
It is probably similar to the blank shooters: Everthing but the cylinder and the barrel is produced like the and with the originals.
And I can not imagine, that especially the barrel could be replaced easily...that would destroy the weapon for safety reasons.