This is a high quality 10 round aftermarket magazine designed for later production Krico .22LR rifles with the straight shaped magazines.
The straight style format will not work in Krico rifles with rectangular magazine wells and curving inners (which take the curved format), this magazine has a rounded front.
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 and is fully strippable for cleaning.