This is a 22-round .22 LR magazine for Mauser Rimfire M-15 rifles. 

Its polymer body provides a lightweight housing for all those rounds, while an anti-tilt polymer follower ensures smooth feeding. It’s hard to find reliable rimfire magazines, but this is one you won’t have to worry about. 

According to Mauser Rimfire, this magazine works best for high-velocity .22LR rounds.

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