We get to see the SIG Air Pro Force MCX Virtus PDW AEG in this presentation by the Airsoft Master as they have it in stock... "The MCX was released during Shotshow 2015 introducing their own shortstroke piston driven AR-15 system. The MCX is well known as a multicaliber rifle that can change 5.56 into 300 black out by changing the outer barrel in a couple of minutes. While the airsoft variant is well known for the vast customizations out their for one simple rifle. Big shout out to GSI for their hop up arm and Black Variable for the Buffer Spring for Mike's APFG MCX builds! Check them out if you need any gas blowback parts for your APFG MCX rifle! If you want to purchase a MCX Virtus AEG, check us out at airsoftmaster.com!"