the rifle timeline.

1 CE

flame thrower

they burn STUFF [https://en.wikipedia.org/wiki/Flamethrower]
May 2, 1520

hand cannon

[https://en.wikipedia.org/wiki/Hand_cannon]
a handgun with a kick
Jul 25, 1840

how tech changed the rifle

[http://www.history.com/topics/american-civil-war/civil-war-technology] you hold this thing with 2 hands
May 2, 1884

the machine gun

[https://en.wikipedia.org/wiki/Machine_gun] stationary and overheat
May 2, 1911

handgun

[https://en.wikipedia.org/wiki/M1911_pistol] you put this guys on your side
Jan 14, 1912

LITTLE WILY

they blow stuff up there [https://en.wikipedia.org/wiki/Armored_car_(military)]
Apr 1, 1918

the lmg

they lay some sippresing fire [https://en.wikipedia.org/wiki/Light_machine_gun]
Apr 16, 1930

carbine

smg with rifle rounds [https://en.wikipedia.org/wiki/Carbine]
May 20, 1940

SMG

A SMALLER LMG made for pistols [https://en.wikipedia.org/wiki/Uzi]
Apr 1, 1975

grenade launcher

the launched warheads smoke and fire [https://en.wikipedia.org/wiki/Grenade_launcher]

flame thrower