SIG Sauer Factory MPX 9mm Gen 2 10 Round Polymer Magazine - MAG-MPX-9-10-KM.
These are factory Sig Sauer MPX Magazines for the 9mm MPX KM. They are made of translucent polymer and hold 10 rounds of 9mm ammunition.
This is the Gen2 magazine for guns with a -KM part number which have a Keymod rail. These have a FDE follower. Please check the original magazine that shipped with your MPX. If it has a FDE follower then this is the magazine you need. If you have a black follower you need Part Number: MAG-MPX-9-10.