"They suck in a war and their range is pathetic."
I am a collector and I can completely agree with this statement. I never saw a ball gun that could go further than 25-30 feet except for the MP-150 and the Bungee Blaster, but the first one is loud as hell and the latter one most people were too scared to use for fear of losing the irreplaceable ammo. It was at this point that my girlfriend and I had to negotiate a day to let me modify and produce Nerf guns.
This is my first attempt at building a homemade Nerf gun. I wanted it to be able to do several key things:
- To be able to fire more than one type of ammo by making some parts interchangeable.
- To be CO2 powered, but not to the point that it weighed a ton.
- To be compact enough that it could be attached to other guns, mainly my LS.
- To be able to prove that a good ball gun can exist.
This is what it looks like fully assembled.
This is its appearance when the center cylinder is removed.
Listed below are the parts that are neded to make this. Use the numbered picture as a guide:
- 1" PVC Slide Repair Coupling (SRC) #1
- 1 1/4" PVC Piping #2
- 1 1/2" PVC Fitting #3
- 1 1/4" PVC Coupling #4
- 1 1/4" PVC End Cap #5
- CO2 Tire Inflator #6
- Schraeder Valve (take it from an old bike tire and cut it out, leaving a 1/2" wide ring of rubber attached) #7
- Epoxy suited for PVC
- Some of OMC's PETG (to be included later this week in the design)
It is quite simple to put together, but it will take a full day to let the epoxy cure completely. First you need to unscrew the two halves of the Repair Coupling. In the center of it is the slide assembly. Put this somewhere safe as it is lubricated and you will need it. The center piece is what will convert it from firing balls to darts. Then you take the PVC coupling and glue it to the back end of the SRC. It will not be a snug fit as the parts are not normally compatible, but epoxy can fix that. While this is setting, take the 1 1/2" fitting and glue it to the front of the SRC as shown in the picture. The larger end is threaded so it is the end to attach and epoxy to the SRC. This will be the receptacle you will place Ballistic balls inside to launch them. Place this piece aside and get the Schraeder valve, a 4"-6" piece of 1 1/4" PVC piping and the PVC cap. These parts will comprise your airtank. Drill a hole through the cap just big enough to push the schraeder through, smear some epoxy on the excess rubber and insert the valve through the inside of the cap. The excess rubber will need to be held down against the inside of the cap when you glue it. I used a 35mm film canister and a vise to ensure that the excess rubber was glued to the wall of the cap. This is as far as you can go until it sets a bit.
Come back in about 2-3 hours and you can continue. Take the PVC cap with the now attached Schraeder valve and add a little bit of epoxy to the outside around the valve stem to ensure an airtight fit. Now take the length of PVC piping and insert it into the coupling that you attached earlier to the SRC. Before you apply the epoxy though, attach the cap to the other side of the piping. Now epoxy the coupling to the piping and the piping to the cap. When this sets, you will have the airtank completed.
That's pretty much it. Allow the epoxy to cure for 24 hours before firing the gun. Now firing it is not as simple as just hooking up the inflator and pulling the trigger. I already tried this and the ranges on Ballistic balls are as bad as any ball gun made by Nerf. This is why you use the SRC. At the point where the two pieces screw together, place about 3-5 layers of plastic bag. Bags from Target work well, but you can also try garbage bags. Don't use those crappy plastic bags from the supermarket. Once you have the bag pieces, pull them over the front half of the SRC and screw the two pieces together. The plastic acts as a burst seal. When the pressure inside the airtank is stronger then the tensile strength of the plastic, it will rupture and the ammo will launch.
I haven't measured the ranges yet as it is dark out, but my house is about 45 feet long. I fired the gun in the basement of my house standing at one end, figuring into it that my body and the gun took about 3 feet of distance. The ball flew from one end of the house to the other and didn't touch the ground. I held the barrel as level as I could. I will do more distance measurements when I get the PETG in and build the dart assembly.
Edited by badger, 03 February 2007 - 07:25 PM.