Thanks for looking!  Here we have what appears to be a complete in the original retail packaging Remington R300 Low Velocity Actuated Fastening Tool. 

I looks like it may have been opened around the top but did not want to crack it open if it had not been previously.  It looks like a new unit and the only wear was on the external plastic packaging but it appears to be excellent.

The Remington R300 is a .22 caliber, low-velocity, semi-automatic powder-actuated fastening tool designed to drive fasteners into concrete or steel. It uses a 10-load strip for efficiency and features a two-step safety system: a trigger switch and a muzzle-loaded spring-compression mechanism. Often, Remington #490 is mentioned in similar contexts as a trigger-actuated, low-velocity tool.
Key Features and Usage:

I ship FAST.  The same day or the next business day.  I will ship with care!