This knex gun is different from other semi auto guns because instead of using manual power to pull back the pin, the tension of wound rubber bands is used, making the trigger easier to pull and very unlikely to break when you pull it.

I give credit to extreme builder for the pullback mechanism (the black wheel)

I also give credit to revtiedye for the trigger and placement of the band wheel

Pros:
Semi automatic
Very sturdy
Shoots farther than most semi auto guns (about 15 feet)

Cons:
Needs to be wound every few shots
Does not shoot as far as a pull-back gun would

ENJOY!

Step 1: Frames and Main Supports

The body frames and mandatory supports of the gun. This step also includes the safety lock

Step 2: Firing Chamber and Magazine

The firing chamber is my original design. The magazine feeds straight into it so it there's no little crevice for rods to get jammed in. This also includes the mag ram.

Step 3: Sight

The sight of the gun-sight also functions as the band guide

Step 4: The Guts

These are the innards of the gun. This includes the pullback mechanism, the band wheel, the trigger, etc.

Step 5: The Butt :)

The butt... a really easy step

Step 6: The Firing Pin

This is the firing pin that extreme builder used-i modified the tip a little to decrease friction.

Step 7: The Chain

This is the big chain that you see on the side of the gun. If you find out a way to replace the chain with gears without getting in the way of the other parts please tell me-the chain causes a lot of friction that makes it harder to pull back the pin.

Step 8: Attaching the Guts

This tells you where to put all the innards. This does not include the outer gears

Step 9: Attaching the Gears and Chain Gears

The outer gears and chain gears of the gun.

Step 10: Adding the Rubber Bands

This is where the rubber bands go

Step 11: Optional Supports

The optional supports. I would use them but you dont have to

Step 12: Winding, Loading, and Firing

You are done!!! It would be best to use a piece of surgical tubing as the wheel bands because it is stronger and thicker, so it is less likely to get jammed.