The is the Mec-Gar 10 round .22LR magazine for the Ruger Mark I and II.
Manufactured from heat treated carbon steel with a blued finish and polymer baseplate.
Mec-Gar are the industry benchmark in pistol magazines, producing the magazines for many brands including CZ and Browning.
Ruger Mark I fitting notes:
- For use in the Ruger Mk I please reverse the baseplate follower stud (easily done by stripping the mag)
- Will fit models from 1971 onwards (stamped A100 on the frame under the left grip panel)