A submachine gun (SMG) is a firearm that combines the automatic fire capability of a machine gun with the cartridge of a pistol, and is usually between the two in weight and size. While during World War II they were a key element to most military arsenals, the advent of the assault rifle has relegated them mostly to military vehicle crews, police units and covert operations use.
A subset of submachine guns are machine pistols, which are SMGs similar in size to ordinary pistols (and in many cases, simply full-auto variants of pistols). Since concealability is the goal for machine pistols, they usually have shoulder stocks that are folding, collapsible, detachable or even completely absent.
The following tags implicate this tag: brugger-thomet_mp9, pp-2000, mac-11, suomi_kp/-31, jatimatic, lanchester_smg, m50_reising, mat-49, p90, thompson_submachine_gun, steyr_tmp, ppsh-41, magpul_fmg-9, mp40, beretta_m12, h&k_mp5, h&k_mp7, mac-10, magpul_pdr, h&k_ump, pp-19_bizon, imi_uzi, type_100, sterling_smg, calico_smg, mp38, h&k_mp5k, m3_greasegun, m7, skorpion_vz._61, h&k_mp5sd, mini_uzi, kriss_vector, and carl_gustaf_m/45 (learn more).