This is the ProMag Sig Sauer MPX 9mm 40-round magazine.

If you’re looking for an extended magazine for your Sig Sauer MPX, this is it!  

With this extended magazine from ProMag, you will not have to worry about durability or reliability. The body is constructed from a proprietary DuPont Zytel-based polymer that is chemical resistant and extreme temperature tested, allowing you to shoot with it year-round in any climate. 

To ensure your rounds are ready to go, an injection-molded polymer follower and heat-treated chrome silicone spring are inside the magazine. These keep them properly aligned and feeding smoothly. 

The Sig Sauer MPX is a versatile pistol-caliber carbine that deserves ample capacity at the ready. This ProMag 40-round magazine will do just that. The icing on the cake? It is made right here in the USA!

Keep your Sig MPX locked and loaded with these 40-round magazines from ProMag! Add one…or ten to your cart before checking out!