ETS (Elite Tactical Systems) creates an affordable and lightweight polymer magazine to pair with your factory magazines. Their durable polymers are tested against shattering warping and cracking. ETS uses tough springs that can stand up to being fully loaded up for extended periods of time without losing tension or functionality. The baseplates that ETS designed allows their mags to be pulled easily from mag pouches and also help with simple magazine disassembly for cleaning and maintenance. Your factory magazines should function just the same as these ETS mags locking the slide back after last round and falling free when ejected.