The mystery weapon picture that’s been showing up around the net, appears to be something that began in Chechnya (where the local Islamic terrorists built improvised weapons firing 55mm rockets), and evolved into a new design for firing RPG rockets. The U.S. Army has come to call the mystery weapon the C5K, and it sports a scope. The C5K is a misnomer, and refers to another improvised weapon (a launcher for an unguided aircraft rocket, the S-5K, a 8.8 pound, 55mm projectile). These mystery weapons are made in small quantities, in workshops set up for that purpose. Things like this are intended to provide an easier-to-handle launcher for RPG rockets.
My guess at the time had been that it was a prop built for media interviews and rallying the insurgents. I thought that some of the welding was a bit heavy-duty for a prop, but it just didn’t look to be a reasonable RPG-type launcher, particularly when so many real RPG launchers are to be had.
Not sure if I’m convinced yet. But it isn’t a photoshop of a toy.