MK-19

an automatic weapon that looks like something from a road runner cartoon, or a half-life team fortress cheat. fires chain-linked 40mm grenades out of the business end at an inhuman rate of fire, kicking significant -ss on the other side when wielded by a competant operator. can fire he, hedp, and a special self-guided round that can locate an enemy insurgent, bore through several layers of clothing into his r-ct-m, and lodge just behind his t-st-cl-s (where it detonates).
the saco industries mk-19 has made you my b-tch, haji.
40mm (not 20) grenade-launching machine gun. capable of firing 350rpm (not 9) in the current mod 3 version.

used by all branches of the us military, with the first prototypes being tested in the kennedy-era and the newer mod 3 entering active use by the gulf war in 1991.
the ranger fired his mk-19 into every somali window he p-ssed while riding with his convoy.
mounted 20mm grenade launcher, which fires 90 grenades a minute. can level a two story building to rubble in three minutes.
the private f-cked up the enemies with a mk-19.