This is the popular Promag 25 round .22LR magazine for the Marlin 795 semi-auto rifle.
Finally the 795 can go head to head with 25 round 10/22! The reviews from across the pond have been very positive.
Made from a tough black DuPont Zytel polymer, it is fully functioning with the 795 last round bolt hold open feature.
As well as the Marlin 795 it will also fit the 795SS, 70, 7000, and 25.