This is the ProMag Kel-Tec P11 9mm 20-round magazine. 

Maximize your Kel-Tec P11’s capacity with a high-quality aftermarket magazine from ProMag! 

This extended magazine is constructed from heat-treated steel and features a corrosion-resistant finish, making it one of the most durable options for your P11. Inside, you’ll find an injection-molded polymer follower keeping each round perfectly aligned within the steel feed lips. 

The side-facing witness holes allow you to keep track of your remaining rounds, and each magazine is backed by a lifetime warranty. What more could you ask for?!

Don’t forget to add a couple of these extended magazines to your cart before checking out! You won’t regret it!