Part 3 involves finishing the upper receiver and working on the handguard.
Material list:
Cardboard or Foam board (your preference)
Cutting utensil (scissors, utility knife, etc)
Cardboard tubes (3 from paper towels, 2 from aluminum foil)
Notebook with wire
Painting tape (optional)
Hot glue gun with glue sticks
Crafting sticks (aka popsicles sticks)
Ruler
Pencil
Reference
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Part 1:
• How to make: Cardboard M4 Part I (L...
Part 2:
• How to make: Cardboard M4 Part II (...
Tac rails:
• How to make: Easy attachment rails fo...
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Check out the video I have done on the M4:
• Cardboard M4 (AR15)