The weapons seen in Red Dwarf are:
Prop Weapons
Used by the Red Dwarf crew members during missions. MK1 used from Season 3 until Season 7 when replaced by the Bazookoid MK2.
Laser Pistols
Laser Pistol & Ejecting Bayonet
Real Weapons
M16A1
Used by Presient Kennedy to assasinate himself.
Mannlicher-Carcano rifle
Used by Lee Harvey Oswald.
Sawn Off Double Barrel Shotgun
Used by Dave Lister(Craig Charles) to use against Hudzen.
Remington 870
A Remington 870 with a pistol grip is the weapon of Hudzen.
Luger P08
Used by the German officer and Ace Rimmer.
Mauser Kar98k
Used by German soldiers when they were about to execute Princess Beryl Bonjella.
MP40
Used by the German soldiers in their futile efforts of stopping Ace Rimmer rescuing Princess Beryl Bonjella.
FN Minimi
Used by one of the Waxdroids.
Lee-Enfield
M1928 Thompson
Used by the Queen Victoria waxdroid to kill the Nazis in the episode Waxworld.
L1A1 SLR
Used by one of the Waxdroids.
Colt Peacemaker
Used by Kryten(Chrome with Ivory grips), by Cat as "The Riviera Kid"(Chrome) and by Bandits in the saloon.
Winchester M1894
Used by Brother Famine.
Steyr AUG
Used by the Security personnel and Brig guards onboard Red Dwarf.
Glock 17
Modified Glock 17s are carried by the Security personnel on Red Dwarf and the Canaries.
Heckler & Koch MP5
Modified Heckler & Koch MP5 submachine guns are used by the Canaries.