I'd call it "Buck 24" (Destiny)

by Anton P. Nym (aka Steve) , London, Ontario, Canada, Sunday, November 16, 2014, 08:19 (3882 days ago) @ kornman00

The gyrojet pistol; a lightweight pistol that fires miniature rockets, the punch of a .50 bullet held in one hand and firing with almost no recoil. (It's absolutely crap at close range, because the rocket's still building up speed, but superb at medium range.)

Pretty it up, add some futuristic stuff like limited target seeking or something, and it'd make a dandy looking Exotic Hand Cannon.

-- Steve's name comes from his first encountering the concept (the '30s pulp Buck Rogers used a gyrojet in the 24th century) and the 1960s cost of each "bullet".