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Tripleshotpistol AKA the Octoshot's backup

#1 User is offline   Buffdaddy 

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Posted 21 March 2012 - 12:02 PM

After making an Octoshot earlier, I was left with spare parts. I figured, "I have a shotgun turret, and a pistol shell. Why not stuff an air tank in there and make a shotgun from the remains?" This is the result.

Excuse the lack of pics in progress; I will explain as best as I can.

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Here is the pistol. Looks close to stock, but has a punch. This is the shell from an Air Zone 8-dart shooter. Now for the insides.

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The turret needs a bit of dremel work to fit. It's actually a millimeter larger in radius than the original, so you'll have to use a sanding bit around the outside for it to fit in its slot properly. Also cut out the front of the shell as shown so that the turret will rotate freely.
Finally, note that there's a ridge around the edge of the turret, on he sealing face. This is bad, as it will prevent the turret from fitting. Sand that flat.

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The rotation mech with this turret is larger than that of the original. No matter. We're planning on rotating by hand, anyway. Not like we can rear-load this thing, given the space constraints. Widen the slot that holds the rotation gear, and cut the gear in half. Put in place, and use epoxy/your adhesive to secure in place.

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The powerplant: an expanded Hornet tank. Drilled a 5/8" hole in the back, and used CPVC, solvent weld, and JB weld to secure everything. YOU MUST BLOW OUT PLASTIC SHAVINGS THOROUGHLY BEFORE YOU START ASSEMBLY. Otherwise, you'll have plastic bits preventing the tank from sealing, making it useless.

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I superglued together the front of the hornet tank, a small length of CPVC, and a rubber o-ring with an ID just smaller than the OD of the pipe. Makes a nice seal against the turret, but needs lubed up if you want to turret to actually turn without difficulty.

At this point, you should carve out the shell as necessary to accommodate your air tank. Secure as needed.

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Here we have a blast button set behind the trigger. with a bit of plastic removed from the shell, the trigger can sit a few millimeters further forward. The end result is that the twp sit side by side, with the former spring peg pressing the button in. Nice and convenient!

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We extended the draw on the slide about 1/2", so that the slide could move all the way backward on its track. And why has all the plastic along this area been sanded down?

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Because we're going to put in a pump here! Specifically, I used a pump from a broken Max-D 3000 super soaker, which is pretty much identical to a 2K pump, OPV included. I cut off part of the tube, leaving enough room for the pump head to move the same distance as the slide without popping out. A hole was drilled in the pump shaft, for letting the slide's metal rod stick through. Once this is secure in the shell, you can use the slide to pump this baby up.

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And there you have it. With 3" PETG barrels and a working tank (as in the piston isn't dried up), I'm getting 30'+ range and decent spreads; I've seen anywhere from 2' to 5' with current testing and a small leak in the tubing.

#2 User is offline   Pause 

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Posted 21 March 2012 - 12:20 PM

Awesome, awesome, awesome! I knew you were going to post this here eventually.
Love the great use of spare parts. Great job!
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View PostDaniel Beaver, on 24 October 2012 - 10:56 AM, said:

Heh.

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#3 User is offline   iamthatcat 

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Posted 21 March 2012 - 01:26 PM

Great use of spares and really clean design. The pump hookup is especially nice. I would like to see an internal pic before it's all buttoned up to get the layout right during build-up.

I imagine a little protection for the guts hanging out the back wouldn't be a bad addition.

#4 User is offline   hamoidar 

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Posted 21 March 2012 - 04:06 PM

Although this is quite the ingenious use of random spare parts, there is one thing: The ranges. 30ft....for all that work you only get 30ft. Is that even as much as the stock pistol?
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#5 User is offline   ACE11 

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Posted 21 March 2012 - 05:13 PM

View Posthamoidar, on 21 March 2012 - 04:06 PM, said:

Although this is quite the ingenious use of random spare parts, there is one thing: The ranges. 30ft....for all that work you only get 30ft. Is that even as much as the stock pistol?

It does shoot 3 darts, you know. ^_^
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#6 User is offline   BabyGandhi 

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Posted 21 March 2012 - 05:22 PM

Do you have any pictures of how you did the petg barrels in the turret?

#7 User is offline   Dyxlesic 

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Posted 22 March 2012 - 08:45 AM

Great job. Reminds me of a mauler from halo. I would think the low ranges are a result of the slow air release rate of the hornet tank, not a result of a bad seal or low air volume. Since you have 3 barrels, in order for it to fire 3x as fast, or a large volume of air is just wasted. I bet an expanded salvo tank would make this thing a great Indoor secondary
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#8 User is offline   Buffdaddy 

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Posted 22 March 2012 - 10:39 AM

View PostDyxlesic, on 22 March 2012 - 08:45 AM, said:

Great job. Reminds me of a mauler from halo. I would think the low ranges are a result of the slow air release rate of the hornet tank, not a result of a bad seal or low air volume. Since you have 3 barrels, in order for it to fire 3x as fast, or a large volume of air is just wasted. I bet an expanded salvo tank would make this thing a great Indoor secondary


Yeah, shotgun loading would be more efficient, but that's not as cool looking! Also, there is no room for a Salvo tank without lots of cutting and losing the near-stock look. Also, I've never had a problem with hornets normally; the piston was dried up on it, and almost ALL the air came out the blast button.

#9 User is offline   Dyxlesic 

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Posted 22 March 2012 - 02:11 PM

I think I didn't explain that very well. The "slow air release" im talking about isn't it's venting through the blast button, but the actual rate at which the air fires from the tank. The hole that goes from tank to barrel is relatively small, so air release is relatively slow. This isn't a problem on it normally, but when expanding the tank, it becomes a relatively inefficien, unless using a long barrel. Multipul barrels magnifies the problem too, becaus the seal As soon as any dart leaves the barrel.
My point is, adding a tank with a faster air release (not faster cycling) would give much better ranges, even if you had the same air volume

But don't get me wrong, I think this thing is pretty sweet, especially for something built from spare parts and leftovers. I'm just thinking of how I would make it better, which is what nerf modders do best
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#10 User is offline   Buffdaddy 

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Posted 22 March 2012 - 02:23 PM

View PostDyxlesic, on 22 March 2012 - 02:11 PM, said:

I think I didn't explain that very well. The "slow air release" im talking about isn't it's venting through the blast button, but the actual rate at which the air fires from the tank. The hole that goes from tank to barrel is relatively small, so air release is relatively slow. This isn't a problem on it normally, but when expanding the tank, it becomes a relatively inefficien, unless using a long barrel. Multipul barrels magnifies the problem too, becaus the seal As soon as any dart leaves the barrel.
My point is, adding a tank with a faster air release (not faster cycling) would give much better ranges, even if you had the same air volume

But don't get me wrong, I think this thing is pretty sweet, especially for something built from spare parts and leftovers. I'm just thinking of how I would make it better, which is what nerf modders do best


Oh, I see what you're getting at! Thanks for the thoughts.

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