A working Knex M4. Fires using a new sear system that allows for better firing. NOT A BLOCK TRIGGER, TRUE TRIGGER SYSTEM!!! Fires approximately 50 feet, much more if you add more rubber bands, can handle a lot. Single shot only, but can be adapted into a magazine type gun quite easily. I will follow up with SOPMOD extras if someone else doesn't first. Sorry for the blurry pics, I need a new camera...
(Most counts are an approximate, I just took a quick count)
Green rods: 100
White rods: 75
Blue rods: 21 + 1 bendable
Yellow rods: 4 + 2 bendable
Red rods: 2
Gray rods: 26 + 1 black one (firing pin)
Gray connectors: 70
White connectors: 4
White "Snowflake" connectors: 27
Red connectors: 33
Green connectors: 110
Yellow connectors: 61
Blue "Snowflake" connectors: 10
Purple connectors: 4
Gray gears: 2
Tan clips: 4
Blue clips: 1
Y-shaped things: 8
U part of joint: 1
Step 1: Front Handgrip
This is the front handgrip, one distinctive feature of the M4. Assemble in order, follow the directions EXACTLY. READ THE NOTES. THEY WILL HELP YOU FIGURE THIS OUT. Something may seem like it changed, but it is probably the other end. This was an extremely difficult part to photograph, so sorry if it's a little confusing. Last revised 11/29/2008.
Picture 1: Expand this out until it is 12 long on each level, 24 long total
Picture 4: The rods don't actually fully snap into a place, however, they are wedged in there as show. Therefore, they will make a soft click if they're in place, and will slide smoothly back and forth.
Picture 5 & 8: These pictures are at opposite ends of the barrel. The orange pieces are snapped on the same way at both ends here
Picture 11: This is just a ramrod, do not add this if you plan on using a magazine system with this gun because it effectively plugs the barrel
Picture 14: The gray connectors between the white snowflake and orange connector can be cut; you can cut the tops off of them, because this is where the magwell will eventually go.
Pictures 15 &16: This is just a suggested barrel design, i was almost out of pieces so whatever i had i used for it, feel free to make a better barrel.
Pictures 4, 5, 9, 10, 11, 12, and 13 are the FIRING END of the gun
Pictures 6 - 8 are the BODY END of the gun.
Step 2: Upper Reciever
The upper reciever portion of the M4. The light blue rod on the back IS one of the bendable blue rods which are very rare; I only have 4 of them from one set. You can make it a straight magazine like the Vietnam era guns, and that would probably be the best way to make a working magazine.
Step 3: Carrying Handle
The distinctive carrying handle for the M4.
PLEASE READ: In the middle, it should not be a white snowflake, it should be a yellow "half snowflake." This allows you to look down the valley of surrounding snowflakes to actually use the sights
Step 4: Lower Reciever
The lower receiver portion of the M4. Contains the true trigger portion, and the sear catch. I took pictures from only one side, but it is exactly the same on the other side.
Picture 2: When referring to the triple greens snapped onto the yellow rod, after a few shots, the top part of the middle one will snap off. It's nothing to be concerned about, just realize that it will happen.
Step 5: Firing Pin and Charging Handle
Firing pin and charging handle.
NOTE: PLEASE READ:!!!!The firing pin only has ONE blue connector, NOT two as it shows in the pictures. I took the pictures then realized that it was wrong when I was putting it together.
You should duct tape the part of the firing pin where it goes hinge half-tan connector-blue connector, I didn't to show what it looked like and because I'm out of duct tape. Also, it wouldn't hurt to have all black rods here (they're stronger) because of the stress that gets put on this portion of the gun.
Step 6: Stock
I only took one picture of the stock. all across the top, it should be solid, "5-across," so the charging handle slides on it smoothly.
Step 7: Assembly
Assembly for the entire thing. Note the placement of the multiple rubberbands.