A Heckler & Koch UMP45 with a reflex sight and RIS foregrip can be briefly seen in Treehouse of Horror XVIII.
Error creating thumbnail: File missingHeckler & Koch UMP45 - .45 ACP. This is a Screen used UMP-45 fitted with a C-More red dot sight and Surefire M900 weaponlight foregrip as used on the films Iron Man (2008) and Live Free or Die Hard. A similar configuration, with the Surefire M900 replaced with a standard RIS foregrip, was used in XXXFile:UMPSimp.jpgA UMP45 can be seen on Homer's gun rack.
Shotguns
Franchi SPAS-12
A possible SPAS-12 can be seen in the gun shop in "The Cartridge Family".
An M16A4 Rifle with a collapsable stock, KAC M5 railed handguards, KAC RIS foregrip and an unidentified scope can be briefly seen in Treehouse of Horror XVIII.
Error creating thumbnail: File missingM16A4 MWS (Modular Weapon System) with KAC M5 railed handguards, AN/PEQ-2 IR designator, KAC RIS foregrip, and Trijicon TA01 4x32 ACOG scope - 5.56x45mm NATO. NOTE: This is the standard USMC style setup.File:UMPSimp.jpgAn M16A4 can be seen in the centre right of Homer's gun rack.
Ruger Mini-14
A Ruger Mini-14 is used by Dight Diddlehopper's accomplice.
Homer used a Handheld Minigun with a chainsaw grip to fight Marge in Treehouse of Horror XVIII.
Error creating thumbnail: File missingAirsoft handheld M134 Minigun with 'Chainsaw grip' to handle the recoil force. This variant was seen in Terminator 2: Judgment Day. This is an airsoft version which retains the half-circle attachment point for the M60 foregrip from Predator; the real T2 minigun did not have this - (fake) 7.62x51mm NATOError creating thumbnail: File missingHomer opens fire with his M134.