This is the CZ 25 round magazine in .22 LR for the CZ 452, CZ 453, CZ455 and CZ 512 rifles.
Developed for the semi-automatic CZ 512 rifle the 25 round 'banana' style magazine is made from a tough glass filled polymer. As the 512 magazines are cross compatible with the CZ 452, 453 and 455 bolt action rifles so is this magazine, it will also fit most BRNO model 2 rifles on which the 452 magazine well was based.
The magazine is very well designed, featuring a matt exterior finish with grip shapes, a gloss interior and a custom spring shape. It also features the usual CZ spring and pin locked baseplate which is easy to remove for cleaning.