-It fires a (2x3)F round, which is larger than the (2x2)F round fired in the D2 (meaning it has more stopping power)
-It is a smaller gun than the D2, in height and length
-More comfortable handle
-More durable gun design (meaning more rubberbands than 6 can be added in the gun)
-It features a leaf firing sight (like the M16's sight), as well as a tactical rails
-The magazine is easier to put into the gun and remove
-The magazine can lock inside the gun, using a lever
-The gun looks better than the D2 (I think it kind off looks like the Thompson Submachine Gun, but thats just me)
-Improved reliability when firing (no jamming-where the round gets stuck in the gun- and greatly reduced chance of double-fire- when 2 rounds or fired off at almost the same time)
-Simpler design, meaning it is easier to build
-Shorter reload time than the D2
-The firing system has also been simplified, with only 2 gears on the side, opposed to 4 (in the D2)
WHEN YOU ARE DONE THIS INSTRUCTABLE, GO TO https://www.instructables.com/id/The-D31-Semi-Automatic-Handgun-Mod/ AND ADD ON THE IMPROVEMENTS!
Soon I will start work on the D3.1 . In this mod, I will fix some issues with the top of the gun, the area around the magazine, the magazine lock will be improved, some kind of safety will be added to prevent you from accidentally pulling the trigger, and a larger round capacity will be added to the gun (maybe 7 or 8 round capacity)
Step 1: Handle
This is the hand hold on the back of the gun.
Step 2: Rubberband Holder+ Magazine Lock Mechanism
For magazine lock mechanism, you will need a very small piece of tape (as in the smallest that you can possibly tear off- maybe like 5mm in length, and whatever the width of your tape is)
Step 3: Magazine
This magazine holds 6 (2x3) bricks (each of which have a flat piece on top).
Step 4: Adding Onto the Handle
This step begins to add a top onto the handle.
Step 5: Trigger + Part of Firing Mechanism
Fairly easy step.
Step 6: Building Up the Back
This just creates a base for the gears to go.
Step 7: Some More of the Firing Mechanism
This creates the firing gears and creates part which stops the 'L' shaped piece from going too far back.
Step 8: The Rest of the Firing Mechanism
This finishes the firing mechanism.
Step 9: Building Up the Back Some More
Short, easy step.
Step 10: Bottom Magazine Holder Part 1
This is the area will hold the magazine in place inside the gun.
Step 11: Bottom Magazine Holder Part 2 + Assembly of the Bottom
This finishes the bottom magazine, attaches the piece made from step 10+11 to the main body, and attaches the piece made from step 2 to the main body.
Step 12: Firing Runway + Building Up the Sides
This fills in the middle of the gun, finishes the firing runway, and builds up the sides of the gun.
Step 13: Top of Gun + Sight
The top of the gun only goes up to where the magazine is, and after that there is space so that the round can easily leave the gun. The sight up of: the tactical rails, the flip up 'bunny ears' rear sight, and the forward sight. (This sight is supposed to work like the M16 sight.)
Step 14: Counterweight Rubberbands
The rubberbands attached to the trigger to keep it from firing.
Step 15: Magazine Placement + Building the Ammo + Magazine Rod
Put the magazine in so that the notches are on the sides. The ammo is 6 (2x3) pieces, each with pieces on the top.
Step 16: Loading Part 1 (Firing Rubberbands)
The D3 needs 6 firing rubberbands. NOTE: Before loading the rubberbands or ammo, you need to put a lubricant (vaseline) on the firing runway, the sides of the magazine (on the inside of it) , each ammo piece all around it, and on the magazine rod (on the part which will make contact with the ammo and inside of the magazine)
Step 17: Loading Part 2 (Loading the Magazine)
Very simple. Put the 6 rounds into the magazine (in the hole in it), then, put the magazine rod on top of all of those, and attach the rubberbands on the magazine to it.