Moonwalker

Moonwalker (1988).

The weapons seen in this movie are:

M1921 Thompson

Michael Jackson uses a M1921 Thompson in the Nightclub to fire at Mr Big (Joe Pesci)'s troops.

M1921 Thompson with 50-round drum magazine .45 ACP

"HEE-HEE! CH'AMONE!"

Heckler & Koch HK94

Mr Big (Joe Pesci)'s troops use "futurized" [[Heckler & Koch MP5#Heckler & Koch HK94|, modded to look futuristic along with an ammo counter.

Heckler & Koch HK94A2 with Full Stock - 9x19mm

Close-up of the HK94. Note the vented extended barrel

Mr. Big's men fire their HK94s

A close-up of the HK94's trigger. Here you can clearly see the distinctive HK triggerguard.

A close-up of the ejection port and ammo counter. 883+ rounds = Moar Dakka.

A good side-profile view of the HK94s that reveal the distinctive retractable buttstock

A henchman uses the light attached to his HK94

Unknown revolver

Two unknown revolvers are seen, both in during the "Smooth Criminal" sequence. One is pulled by a thug when Michael enters the speakeasy, and the other is used by Michael Jackson to shoot a thug.

He's really, really bad.

Shoulder Mounted Laser Cannon

Used by Mr Big (Joe Pesci)'s troops in the final battle scene.

A closeup of the grip and trigger on one of the laser cannons

Mr' Big's men ready their laser cannons

The mooks fire at Giant Robot Spaceship Michael Jackson. And no, it does not make sense in context