Hybrid magazine. Construction of high density and high resistant polymer with metal feed ramps. It has a capacity of 20 rounds in the case of the UCR and 30 rounds in the case of the UPR.
It is a very light magazine and easy to disassemble and clean.
Universal design and it can be replaced for generic metal magazines in case of emergency.
Anti-tilt follower (goes up and down in a parallel position) which helps to feed the rounds in the right angle to the receiver.