ERMA .22 conversion for Lugar Pistol

ERMA .22 conversion for Lugar Pistol. Very good condition showing some use. My father had this piece as long as I can remember, since the mid '60s at least. He told me he did not ever install it on his Lugar so it has been sitting unused for over 45years that I know of. The bluing is in good condition. No rust or pitting on any of the pieces. The bore is shiny with clean sharp rifling. Kit consists of 1 barrel, I believe this fits a 4 inch barrel Lugar, it measures 4 inches from the front of the chamber block to the sleeve. (Sleeve is 2 1/2 inches long), 1 bolt/slide and 1 magazine. All pieces are marked "Made in Germany", bolt also has "ERMA" logo on top. I do not have the original box or instructions. I will answer any questions you may have about it as best I can.