This 10 round magazine is a factory original from CZ

Made from a tough ballistic nylon polymer with stainless follower it features a U shape notch in front of the bullet to eliminate shaving and is easily stripped for cleaning.

Also fits:

BRNO - fits the majority of BRNO rifles, including the common BRNO model 2, however some older BRNO models can experienced lockup problems - CZ steel magazines are the safe alternative (they are the original BRNO magazine pattern, made on the same machines)