The latest design, as seen here on the airsoft counter part features a ported front end that acts as a compensator, directing gases downwards helping the gun shoot flatter.  It also features standard picatinny rail on the top and bottom the the gun for the mounting of optics, lights, and/or lasers.

The recoil impulse of the pistol is superb and features a relatively high FPS at approximately 350+/-.  The pistol is driven by green gas and features a 27rd magazine.