Another challenge
 

This batch of weapons and accessories came with two toys I bought online. It had Jurassic Park, Star Wars, A-Team, G.I. Joe, Remco Toys KO G.I. Joe, T-Bob and Zoids parts.

That I couldn't find the ID of that big gun still surprises me. The crotch piece of the G.I. Joe-style figure is pretty difficult to ID as well, not to mention that Power Rangers'esque helmet. It's not the Black Ranger and it could fit on a G.I. Joe figure.

Edit:

Sheet one:
Nr. 1: Action Man Space Commando
Nr. 4: Horikawa Galaxy Super Mechanic Fighter Deluxe Toy Robot

Sheet 2:
Nr. 3: GI JOE Cobra Heli-Viper
Nr. 5: Chap Mai Soldier Force
Nr. 6: X-Changers Acama Toys
Nr. 9: 'Space Force Weapons Pack

Just found that nr. 9 is Action Force - 'Space Force Weapons Pack'. Damaged, though.

Edit:
This is a close-up of that big gun.

3. GI JOE Cobra Heli-Viper

5. Looks like early Chap Mei soldier force or a knock off of such.

#1 is Action Man Space Commando
Item: Space Commando
#4 is Horikawa Galaxy Super Mechanic Fighter Deluxe Toy Robot

Thanks, yeah that was Cobra Heli-Viper. Difficult to ID later GI Joe. As for that Chap Mei. Yeah, it isn't Action Man. Not sure if it's 'big G.I. Joe' either. Must be something else.

Excellent finds, thanks.