Note: The grenade launcher has a block trigger but since this is more of a secondary, special, or back-up weapon I guess it doesn't matter as much.
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Step 1: Making the Components
Picture 1: Make 2 (Lets for now call these part A).
Picture 2: Make 1 (Lets call this part B).
Picture 3: Make 1 (Lets call this part C).
Picture 4: Make 1.
Picture 5: Make 1.
Step 2: Construction
Picture 1-2: Add "Y" clips where shown (there should be 8 of them).
Picture 3-4: Add the earlier made parts where shown.
Picture 5: Place white rods where shown.
Picture 6: Add the earlier made ram rod and add rubber band(s).
Step 3: Ammo
Step 4: Placing, Loading, and Firing
Warning- This may cause harm or injury if misused. Do not point it at people. I am not responsible for damage, injury, or death caused by this instructable.