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Everything Nerf. => Modifications => Topic started by: Nerf Doctor on March 31, 2015, 05:34:19 pm

Title: Nerf DoubleDown Mod Guide: Part 1
Post by: Nerf Doctor on March 31, 2015, 05:34:19 pm
Saw the DoubleDown for the first time awhile back and decided I needed what was essentially Nerf's answer to the SNAP
(http://i.imgur.com/CX6hCrI.jpg) (http://imgur.com/CX6hCrI)
So I bought one.
(http://i.imgur.com/8QAgQV0.jpg) (http://imgur.com/8QAgQV0)
It's a little bigger than I thought it would be, but my hands still manage to make it look tiny.
(http://i.imgur.com/JDKTLmb.jpg) (http://imgur.com/JDKTLmb)
(http://i.imgur.com/LwDbiwg.jpg) (http://imgur.com/LwDbiwg)
First things first, take the 6 screws out of the left side of the handle
(http://i.imgur.com/ktLHZbh.jpg) (http://imgur.com/ktLHZbh)
(http://i.imgur.com/YyioYxO.jpg) (http://imgur.com/YyioYxO)
Then, pry the left side of the handle off, take a moment to appreciate the simple catch system
(http://i.imgur.com/KN2hF1c.jpg) (http://imgur.com/KN2hF1c)
then separate the handle from the body of the blaster, leaving you with this
(http://i.imgur.com/DCjZziI.jpg) (http://imgur.com/DCjZziI)
Quick note here, the very front of the barrels comes off with a single screw, but it doesn't do anything useful
(http://i.imgur.com/gKUVni1.jpg) (http://imgur.com/gKUVni1)
(http://i.imgur.com/Ze6R4SY.jpg) (http://imgur.com/Ze6R4SY)
Continuing on, remove the 4 screws from the rear of the plungertube and remove the plunger assembly from the plungertube
(http://i.imgur.com/LwDbiwg.jpg) (http://imgur.com/LwDbiwg)
(http://i.imgur.com/iwqW9JL.jpg) (http://imgur.com/iwqW9JL)
Take a moment to familiarize yourself with the plungerhead.
(http://i.imgur.com/nUKqwpu.jpg) (http://imgur.com/nUKqwpu)
Inside the plungerhead is a square recess where the plungerrod sits when screwed on via the screw in the front of the plungerhead.
(http://i.imgur.com/F1OqKd5.jpg) (http://imgur.com/F1OqKd5)
What I ended up cutting out of the catch ring, although you can actually skip this and still be able to use the o-ring wall as a catch, just hold the trigger down longer to shoot well.
(http://i.imgur.com/zEosb1A.jpg) (http://imgur.com/zEosb1A)
Teflon tape under the o-ring for a better seal.
(http://i.imgur.com/7E3RawN.jpg) (http://imgur.com/7E3RawN)
How my plunger cap looks cut down.
For this first part of the mod, which I'm still working on getting decent pictures of since my camera died partway through, I cut down the 2 prongs on the end cap seen in the pictures above. This allows the plungerhead to be pulled farther back and giving us longer draw. This is actually unnecessary, but I also cut the bottom of the catch ring on the plungerhead down so that it won't catch until the back ridge that holds the o-ring, but you can actually pull it back all the way without cutting down anything. Using the original catch notch, I get about 1.5" of draw; using the farther notch, I'm getting about 2.25" of draw Not a huge increase, and not much of a performance boost stock, but with a stronger spring and new barrels that .75" increase will be quite handy.

Now, this will be a multi-part guide as I'm currently swamped with school work and actual work, and I don't have many of my tools here, but I'll work with what I got at the pace that I can. I do plan on going as far as I can with the DoubleDown, and I figure a single topic that I continue to add to is better than several post, so I'll just edit this whenever I do something new to it.

DoubleDown Facts

Uses a "smart AR" system, firing the right barrel first then the left
Tested with a single dart in alternate barrels, the right barrel shoots harder
The handle is actually pretty comfy for me, even though it's small, and I can see it perhaps used as a springer homemade handle for those who don't want 3D printed
The barrel end, while being essentially useless, could be useful for a barrel space/breach "handle" for longer barrels or a possible airgun conversion(thinking about it)
The pull handle on the plungerrod is a good deal sturdier than the NiteFinder, which is the only similar handle I know of.
Seeing as there isn't much holding the body of the blaster to the handle, reinforcement seems like a must for stronger springs.

If you have suggestions for mods to this, feel free to comment.

Edit: More pics of the plungerhead

Title: Re: Nerf DoubleDown Mod Guide: Part 1
Post by: Techshooter on March 31, 2015, 09:04:37 pm
This is essentially a larger jolt, right? I love you picture quality, it's incredible. What kind of camera do you use?

Title: Re: Nerf DoubleDown Mod Guide: Part 1
Post by: Nerf Doctor on April 01, 2015, 06:48:52 am
Yeah, this, the SharpFire, and the new SnapFire are essentially giant Jolts, with the SharpFire also having a different priming mech. And the camera is a 14megapixel Olympus Stylus 5010, so the pictures are huge when you click on them, but I still need to find somewhere with decent lighting.

Title: Re: Nerf DoubleDown Mod Guide: Part 1
Post by: Zero96 on April 03, 2015, 04:50:23 pm
Man I want one of these haha.

Title: Re: Nerf DoubleDown Mod Guide: Part 1
Post by: Nerf Doctor on April 05, 2015, 11:52:21 pm
Added a picture to show exactly where I cut, but I would not advise actually cutting it. Without cutting it, you can still just pull the plungerhead back past the catch ring and to the o-ring wall, but I would not suggest this as I noticed wear on my o-ring after doing this. Eventually though I'll get around to modifying the plungerhead to allow more draw. Also, I have noticed decently better performance from both barrels after simply applying teflon tape to the plungerhead, so I guess it just has a S**Tty seal stock.