Materials Needed for Double Shotgun:
2 x 2" PVC Tee Couplers
6" of 2" PVC
18" of 1.5" PVC
1.25" PVC Ball Valve (2" ball valve works, and is easier, but costs a lot more)
PVC Primer & Cement
Dremel (or other cutting/sanding tool)
Oh yeah, and two titans
Materials Needed for NERFshot Shells:
3/8" Backer Rod
Pipe Insulator (3/4" Copper, 1/2" Iron)
Craft Foam Sheet
Making the Double Shotgun
1) Open up your Titan(s) and sand out everything that is in the air tank area
2) Cut a circular hole on one side (you'll do this twice, once for each guns, on opposite sides of yout Titans) with its center located just rear of the air-tank's midpoint. The hole should be big enough for the "Tee end" of the tee coupler (the odd end) to fit through so it can stick out the side of your Titan.
3) Cut down the two straight ends (not the odd end facing out perpendicularly) so that the length from one end to the other is just shorter than the length of the air-tank.
4) Sand out the inside of the PVC coupler so that the Titan air-tank can fit inside it and push the coupler over the Titan's air tank.
5) Push the odd end of the Tee coupler through the hole you cut in the side of the Titan.
6) Create an Epoxy Seal around the inside of the coupler and the wall of the air tank.
7) Drill/Cut a hole in the air-tank wall at least a 1/2" diameter (I just went all the way to the edges, without ruining the epoxy seal).
8) Set your two Titans with the two Tee ends facing in toward each other (you have to do all the above steps twice, once for each gun, just on opposite sides of the Titan) and sand the outside of your ball valve (if you're using the 1.24" valve) slightly (mostly just removing the raised lettering) and push your 2" PVC over the ends.
9) Determine how far apart you want your Titans to be (about shoulder width) and cut down your 2" PVC to the appropriate length. Insert the 2" PVC into the 2" Tee couplers and make sure everything fits the way you want it to.
10) Use PVC Primer (the usually purple ugly stuff-thin as water) and PVC Cement (the clear syrupy stinky stuff) to adhere all the PVC together (inside coupler and over Ball Valve). The 2" PVC over the ball valve seals perfectly (perhaps a little tighter than PVC in a coupler) and is going to last alot longer than the stock parts of the Titan.
11) Cut the Titan's stock barrel down to about 1.5" (the length of the screw threads) and place a 9" barrel of 1.5" PVC over it. (To create a better seal but not have it permanently attached, spray the Titan barrel stub with Silicon and then apply hot glue to the base end of your PVC barrel. Push the PVC over the barrel stub and turn rapidly. The hot glue won't stick to the barrel stub but will shape itself into a good seal).
12) Re-assemble your Titan and you're good to go.
Making your NERFshot Shells
1) Make 3/8" nano stefans weighted with copper BB's and hot glue.
2) Cut a 1.5" segment of your pipe insulator (or for a double capacity shell, make it three inches).
3) Dremel/sand out the inside of the pipe insulator until the walls are about 3/16". (Depending on your brand of pipe insulator, you may need to cut a small strip out of your pipe insulator so that it can fit inside the 1.5" PVC).
4) Cut a circle of craft foam with a diameter just less than the ID of the 1.5" PVC.
5) Hot glue the craft foam disc to the segment of pipe insulator (if you're having difficulty with that part, do it before Step #3, but then Step #3 is a bit more difficult)
6) "Fringe" your shell into six equal part by cutting from the top to the base (just above the hot glue) of the pip insulator.
7) Load eight nano stefans into your NERFshot Shell and have fun! (If you're using a double capacity NERFshot Shell, load in sixteen darts, one on top of the other).
Operating the Gun
1) Pump up your Titans (or, do as I did and attach it to your favorite external air tank).
2) For one super-power-shot (w/ 3x the air output of a normal Titan) leave the valve open and pull the trigger on your barrel of choice to launch your Doom Foam!
3) For two still-very-powerful--but-not-ridiculously-so shots, close the ball valve and fire off one barrel and then the other.
A Short Video (8 Seconds) (If you look closely you can see the NERFshot Shells falling to the ground next to me).
To carry around extra rounds I simply place them in a short length of 1.5" PVC with a ring of hot glue on the inside so the shell doesn't fall through.
Ranges are around 65', occasionally reaching over 70'. It's not extremely efficient, but it is a lot of fun to nail a group with this. The spread at 60' is about 10' (with up to 32 darts, that's not overly scattered). I've never missed with this gun, but I don't use it that much.
Questions? Comments. Rebukes!
Edited by imaseoulman, 13 March 2008 - 08:52 AM.