This is a high quality 10 round aftermarket magazine designed for later production Krico .22LR rifles with the straight shaped magazines.
Please note: most historic Krico rifles used the curved format magazines which have a distinctive magazine catch notch at the top rear of the magazine and a slight curve inside the magazine well. This type is for late production Krico models (made under contract by Weihrauch) where the magazine catch locking point is located level with the bottom of the bottom metal, note the lug location in the photos.
The magazine is manufactured from blued steel with a stainless steel follower.