This is the 10 round 12 Guage magazine for Vepr format shotguns by SGM Tactical.
Modification is required to fit Armsan RS-S1 and Citadel RS-S1, an easy task with a dremel:
- the rear of the magazine needs opening slightly on the right to allow clearance for the bolt hold lever to drop down
- the outer edge of the feed lips needs a chamfer adding to allow clearance of the lip inside the magazine well
Manufactured from tough Dupont Zytel polymer with steel top lips and corrosion resistant springs.