A little harder gun then my hand gun. Some of the steps are not really clear but just try to follow it or do what every you think need to do. Some of the pic in this Instructables have a slide but on this instructables there isn't anything about the slide but I will make another one later with the slide. Sorry!
Oh yea thank Darth Gecko Man for the main gun design.
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Step 1: Part 1
This is the part 1 of the gun.
Step 2: Part 2
part 2 of the gun
Step 3: Part 3
part 3 of the gun
Step 4: Building the Trigger and the Firing Pin
Step 5: Handle
Step 6: Assembling the Parts
follow the steps
Step 7: Adding the Rubber Bands
not really clear just try to follow the step or just put one where you think you need it.