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This is the Gen 2 that has been "updated to accommodate the multi-caliber functionality of the platform."

HI Victor, it is Gen 2. Taking the market by storm, the Sig Sauer MPX Pistol has redefined the submachinegun category. Every component of the MPX has been thoroughly designed and rigorously tested to ensure reliability in any circumstance. Features AR-style ambidextrous controls, 8" barrel, rotating bolt system, short stroke piston, flared and beveled magwell, monolithic upper receiver, Keymod aluminum handguard with pistol stabilizing brace, and a 30RD 9mm magazine capacity. Comes with one 30RD (Gen 2) magazine.

Gen 2 UPC:  798681537662 Description:  SIG MPX PDW PST 9MM 30R B FLD Brand:  Sig Sauer Model:  SIGMPX PDW W/ Aluminum KeyMod Hand Guard Type:  Pistol: Semi-Auto Caliber:  9MM Finish:  Black Action:  Semi-Automatic Stock:  Folding SBX (Stabilizing Brace) Sight:  No Sights Barrel Length:  8  Overall Length:  17 Weight:  5 lbs Capacity:  30+1 # of Mags:  1 Safety:  Ambi Thumb Safety Receiver:  Aluminum Packaging:  Plastic Case Features:  Short Stroke Piston System, Handstop; Ambidextrous Selector, Mag Release, Bolt Release