SIG Sauer introduced the MPX in several variants. It’s a daring move to start producing pistol-caliber submachine guns with all these new AR-style rifles that dominate the market. SIG actually knew what they were up against. The aim was to develop a submachine gun that would take up the mantle of the H&K MP5 and upset the iconic round. You can easily spot how the manufacturer had a military blueprint in mind, despite the MPX being semi-automatic instead of fully automatic. The first blueprints and prototypes were thought up in 2013, but the final version of the standard MPX was released on the market in 2015. SIG Sauer developed the MPX Pistol as a pistol-caliber (which explains the ‘P’ in the name), a short-barreled rifle (SBR), and it also ticked the box of a submachine gun.

The Difference Between the Military-Grade MPX and the Civilian Model Though the retail price is still high, it’s more than halved of the MP5, and the firearm is much easier to handle and maintain.

That’s why SIG Sauer went for a design that would fill those voids and offer a new treat for the civilian market-the SIG Sauer MPX Pistol. Not to mention the massive price tag that still hangs heavy on the MP5. The stamped and welded receivers just don’t cut it anymore, and though the roller-delayed blowback is a tried-and-true mechanism, it doesn’t come with its reliability issues.

Now that more than 50 years have passed, it’s safe to say that the seemingly timeless blueprint of the MP5 is now obsolete. Developed in the 60s, the MP5 submachine gun has quickly become the most iconic and best-selling firearm in SMG history. When someone’s talking about pistol-caliber submachine guns, I immediately picture an H&K MP5.

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