M3 Grease Gun: full disassembly & assembly - YouTube
Police find homemade submachine gun -The Firearm Blog
Bootleg Gunz:The Bazaar of Bizarre Guns - "A .45 homemade submachine gun made by Ulster loyalist paramilitaries held in a Greater Manchester police armoury. It appears to use an M3 Grease Gun
P.A. Luty 9 mm sub-machine guns - Armament Research Services (ARES)
Grease Gun Storage : 7 Steps - Instructables
ArtStation - Homemade gun AVR2 | Resources
Bootleg Gunz:The Bazaar of Bizarre Guns - A simple homemade SMG with magazine | Facebook