I know the M50 SMG is...that one ended belonging to me. I sold all of my Class 3 items around 2001-3. My SMG collection was weak compared to the people I knew back then:

MK Arms Mk760 (clone of S&W 76 made on their tooling)
Uzi
Sten Mk5 (very rare C&R)
Reising M50
Mac11
Inland M2 Carbine (very rare C&R)

I also had a Ruger Mk2 Suppressed.

JYD #123 The great one formerly known as Architect.

I am now a fictional British television police officer (currently a Detective Sgt) at Thames Valley Station. My governor is Detective Inspector Fred Thursday and it’s 1969.