This is the HK USP-FS 9mm 31-round extended magazine. 

If you just picked up an HK USP-FS and want to maximize your capacity, these 31-round magazines are for you! 

Constructed from a durable but lightweight polymer, these extended magazines will save you plenty of time at the range by reducing your number of reloads. Inside, you’ll find a high-quality steel spring and anti-tilt polymer follower that work together to provide ample reliability.  

To keep track of your remaining rounds, you’ll find rear-facing witness holes, making these ideal for all training purposes. Your HK USP-FS deserves the best magazine available, and this is it!

Don’t forget to add some of these extended magazines to your cart before you checkout!