Here is a really easy way to make a Lego Man RPG launcher out of only 3 lego pieces.
Step 1: Materials
You will need:
1 LEGO megaphone
1 LEGO round brick 1x1
1 LEGO Tap 4.9/6.4
Step 2: First Step
Take the LEGO megaphone and attach it to the LEGO round brick 1x1, like shown.
Step 3: Second Step
After connecting the LEGO megaphone and the LEGO round brick 1x1, you need to add on the LEGO tap 4.9/6.4 to make the RPG launcher.
Step 4: LEGO RPG launcher
This is what the LEGO RPG looks like when it is connected to a LEGO guy.