they may not be 25 rnd mags but gevarm .22lr rifles use single stack straight mags with a capacity of 20rnds i can take pics if you like
amazing. They were more advanced back then than they are now lol

would love this with a short barrel and a tactical stock
http://www.studentsof########.info/sites/divers/img/947_armement-carabines-gevarm.jpg