Looks like a Patriot Pistol variant front end, that one in particular looks like Bushmaster V-Match free floating handguard (the short one), most likely an 8.5 inch barrel, and looks like either a Phantom or Vortex flash hider. That website is disgustingly sloppy/inaccurate.
Here's something similar (Madbull's Patriot kit) but with the large Patriot muzzle brake
Airsoft Parts used to have one of these kits, they can probably hook you up.