About Real SIG MPX
The SIG MPX is a gas-operated submachine gun designed and manufactured by SIG Sauer, and is primarily chambered in 9?19mm Parabellum cartridge. It is a gas-operated firearm featuring a closed, rotating bolt. These design features, rare in submachine guns, were chosen to enhance the safety of the user and to have a more reliable firearm. It was designed in 2013 and was released to the general public in 2015. It features the SIG Sauer short stroke push-rod gas system to reduce the recoil and improve the reliability of the weapon.

SIG Sauer (SIG AIR/ VFC) MPX AEG Airsoft Rifle
1/1 Scale High Power Assembled Electric Powered Airsoft AEG
Semi/ Fully Automatic Shooting Mode

CNC Metal Lower Receiver & Upper Receiver
Metal M LOK Handguard
Open Full-length Picatinny Top Rail
Metal Outer Barrel With Muzzle Brake (14mm CCW)
Polymer Pistol Grip
Metal Trigger, Selector, Blot Catch, Magazine Relaese & Charging Handle
Metal 100 Rounds Loading Capacity Magazine
MCX/MPX Folding & Telescoping Stock

Internally the MPX features a version 2.1 gearbox, same as the one found inside the MCX.  Its battery is wired to the front of the gun and its inner barrel is 168mm long. 
7.4v with Small Tamiya
Adjustable Hop-Up System