[SkyDancer]

And as I understand, a full drum plus the gun weighed almost fifty pounds.

[Tijeras_Slim]

Overall length of gun with stock: 33 3/4”.
Overall length of gun without stock: 25 1/4”.
Weight (without magazine): 10 lbs.
Weight of gun with drum magazine, loaded:
50 rounds: 14 3/4 lbs.
Weight of gun with box magazine, loaded
20 rounds: 11 1/4 lbs.
30 rounds: 11 3/4 lbs.
Barrel length without Cutts compensator: 10 1/4”.
Barrel length with Cutts compensator: 12 1/2”.
Rifling, right-hand one turn in 16”.
Rate of fire, semi-automatic (single-aimed shots) per minute: Up to 100.
Cyclic rate of fire, fully automatic (approx.) 700 rnds. per min.

[Blood of Tyrants]

Nowhere near that much. 20 lbs at most.

[Calvin Locke]

War manufacturing redesign eliminated the drum magazine fittings. The drum held 50 vs 30 for the straight mag.

I'll guess the drum was problematic in both mfg and use, not to mention carrying the extra mags.

[Chuckster]

I got to handle and fire one in Vietnam. It was very heavy but certainly spoke with authority. I carried a Swedish K for a while. light weight, compact, 9mm, relatively slow cyclic rate. I didn’t like it. I wanted a M14 but couldn’t get my hands on one so I ended up carrying the M16 and a 1911. Fortunately, I was an artillery crewman so my personal weapon was not critical.

[Big Red Badger]

Auto-Ordinance,

makes “Chicago Typewriters”

1200 bucks or so can get you going !