...after those posts below. So, here it is. The Castle's Colt SP1, mounting a AN/PVS2 night vision scope. With bayonet, as a form of immersion therapy for 11B40 who apparently gets the heebie-jeebies from sharp pointy things. Small tidbit of trivia - the AN stands for "Army Navy" meaning a bit of kit (very oft-times comms gear) developed for use by both the Army and Marines, and sometimes actually the Navy... [The pic will enlargify if you have the sekrit code.]