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I got one of the new super soaker waterguns (http://www.hasbro.com/nerf/en_US/supersoaker/) with the water magazine, but it ran out quickly. This is my solution, i used my water backpack and replaced the mouthpeice with a tube to go into my watergun. This is my first instructable if there is anything i can do better let me know.

Step 1: Materials

3" of 1/2" cpvc or pex (i used cpvc)
A 1/2" pex barb threaded male adapter
A  1/2" to (whatever size tubing your water backpack has) threaded female adapter
a (whatever size tubing your water backpack has) threaded male barb adapter
A heat gun(for the pex)
A cuttable block of wood or plastic
A powerdrill with a 7/8" bit
A chop saw 
A table saw
Sandpaper
A water backpack (like in the picture)
Spare screws
a hot glue gun
A strap of some kind

Step 2: The Wood Block

Take your wood block and cut it so it is 3x1" and then drill a 7/8" hole about 2cm from the end. Make sure the block fits and the hole lines up with the magazine adapter (circled in the picture) you may need to sand the block to get it to fit.  

Step 3: The Adapter

Cut the pex to about 2 1/4".Take the heat gun and heat it up so you can put the 1/2" barb in it and let it cool. Now put the 1/2" to (whatever size tubing your water backpack has) female adapter on the 1/2" barb and the male barb adapter on the other end.

Step 4: Putting It Together

Slide the pex into the wood block as far as you can, you may need to sand it but make sure it is a tight fit. Put the pex over  the magazine adapter and push the wood block down as far as you can and hot glue it in place. put a screw in the top so the top of the screw is even with the top of the pex, i would do this by hand. OPTIONAL: pit a second screw on the bottom to hold a strap in place. when you are done it should look like the picture. attach it all up and you are ready to go.
This is interesting! I was wondering if you could tell me how to do this, except rigged to a Waterzooka so that it automatically refills after every shot. <br><br>https://www.instructables.com/id/The-Ultimate-Squirt-Gun-Build-a-WATERZOOKA/
Well, you would need a t joint and then a vaulve behind the end cap, and then make an adapter to attach the tubeing to the pvc (the peaple at home depot will help you out) and connect it to the t joint. You would close the vaulve and when you pull back the plunder the water would be suked into the tube and then you can open the vaulve and shoot
I would use a one way valve (mod a water gun fill cap)
lol I have 2 camelbaks and 2 outdoor cyclone hydration systems. 7 liters total
you should attach them all to a watergun but it would be a pain to carry it all
Great idea for almost unlimited ammo! I love the idea!

About This Instructable

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Bio: I like to play with electronics, and take stuff apart. Sometimes i do woodworking projects with my dad.
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