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Tech Target Internals Replacement


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#1 Green Wing

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Posted 11 July 2012 - 11:13 AM

This mod maximizes the potential of the Tech Target while keeping the stock look. I have tried many other TTG mods such as the standard coupler, single barrel, and MDET but this is by far my favorite method.
Materials

-1" PETG Tubing
-3/8" square rod
-[k26] spring
-1x 1/2" PVC Coupler
-Small segment of 1/2" SCH 40 PVC
-E-Tape
-Packing Tape(Or just use E-tape)
-1x 6/32 Hex Locknut
-1x 2" long 6/32 screw
-2x 1.5" long 6/32 screw
-1x NF plungerhead w/ O-ring or equivalent

Open up the blaster, then cut down the shell on both sides to look like this:

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Ignore the small hole there for now.

Now cut down your 1" PETG so that it is about 1mm shy of 7" in length. It should fit in the shell comfortably and be flush with the front of the shell.

Cut a piece of 1/2" PVC and cut it down to about 1.5" Put some sort of adhesive on one side and jam it into the 1/2" PVC coupler.

Wrap it in packing tape or E-Tape until it has a snug fit in the 1" PETG. Pad the end of the PVC with 1-2 layers of craft foam, amd push the assembly into the 1" PETG. Wrap some E-Tape near the back of the 1" PETG so that it has no wobble when you close the shell. Now you want to drill all the way through both sides of the shell with the entire plunger tube assembly together, right where the middle of the PVC is in the PETG. Tap it for 6/32.

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Now take your 3/8" square rod and plunger head, push it up to the front of the plunger tube(Coupler assembly inserted) And see how long you want to make the 3/8" rod(Depending on what kind of handle you want).

Drill and tap a 1.5" hole for 6/32" directly in the middle of one end of the 3/8 rod. Attach your plunger head and O-Ring, lube with Silicone grease(I used 2 O-Rings). Pad the front of the plungerhead with 1 layer of craft foam.

Cut a [k26] to 5". This leaves some slack in the front to increase longevity, and reduce kick/noise. If you want you can make it 5.5" to get rid of the slack; but you will need to cut your catch notch farther down than this picture.

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Trim the back of the shell and catch to make room for the 3/8" rod. Make whatever handle you want. I used a piece of 1/2" Nylon rod with a 1.5" 6/32" screw attatching it.

IMG]http://i1038.photobucket.com/albums/a463/greenwing1/Nerf%20stuff/P1220026-1.jpg[/IMG]
IMG]http://i1038.photobucket.com/albums/a463/greenwing1/Nerf%20stuff/P1220027-1.jpg[/IMG]

Now replace your catch spring with something much stronger. I got mine from ACE.

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Goop in the coupler assembly. Make sure the holes line up. Put the rest of the blaster together.

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Screw the blaster together. Then put the 2" 6/32" screw through the front holes you made to attach the coupler assembly to the shell. Trim down the screw so there is just enough for your locknut to attach flush with the shell.

Make a speedloader and you are done!

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The max draw on these is 4 1/4" with 5" of a [k26] spring. If you get rid of the slack with a slightly longer spring, it will be about 4" of draw.

I added cpvc ammo holders. A 9"-11" barrel workes well.

I am getting around 85'-95' flat with #8, #6 and MIG style slug darts. They are super easy to make and are actually quite durable. They have even survived the hands of 13 year olds in wars. :lol:

Firing video if you are interested:
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#2 ShaNayNay

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Posted 11 July 2012 - 12:14 PM

Nice mod and nice write-up. I recently aquired a Tech Target gun, and would love to do this mod to it. My only problem is that I don't own any PETG yet, can you think of any materials off the top of your head that I could use as a substitute?
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#3 thesaz123

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Posted 11 July 2012 - 12:22 PM

Nice mod and nice write-up. I recently aquired a Tech Target gun, and would love to do this mod to it. My only problem is that I don't own any PETG yet, can you think of any materials off the top of your head that I could use as a substitute?


You should be able to find 1inch PETG at petsmart or petco in the aquarium supplies aisle. If not, 3/4inch thinwall PVC works well too. (i happen to have some of this if you need any. shoot me a pm if so)

Edited by thesaz123, 11 July 2012 - 12:24 PM.

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#4 Ozymandias

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Posted 11 July 2012 - 01:04 PM

Is the plunger rod Polyethylene (8702K476)?
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#5 Green Wing

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Posted 11 July 2012 - 01:43 PM

Is the plunger rod Polyethylene (8702K476)?


No, the ones I used were PVC. I would reccommend Nylon or Delrin though. I only used PVC because that was all I had. I have never used Polyethylene.
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#6 Cambo11235

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Posted 11 July 2012 - 03:00 PM

@Shay Nay Nay,
As a substitute for the PETG, you may be able to use 3/4 inch thinwall pvc, usually found at ACE and maybe home depot.
I've done a new NFs with the material and its the same OD as the NF plunger tube and about 2/100ths of an inch smaller ID.
If if remember correctly the Tech Target PT is about the same Diameter as the NF so that should work
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#7 exploe

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Posted 11 July 2012 - 03:12 PM

Nice mod and nice write-up. I recently aquired a Tech Target gun, and would love to do this mod to it. My only problem is that I don't own any PETG yet, can you think of any materials off the top of your head that I could use as a substitute?


For my NF rifle, I used 1 inch Polycarbonate tube from Mcmaster, and it should work for this application as well.
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#8 Briguy52

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Posted 11 July 2012 - 05:28 PM

Could you just use a 1" rubber washer sandwiched between 2 3/4" washers for the plunger head?
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#9 Green Wing

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Posted 11 July 2012 - 06:25 PM

Could you just use a 1" rubber washer sandwiched between 2 3/4" washers for the plunger head?


It should in theory but you will have to test it out to see how well it works.
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#10 spencerak

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Posted 11 July 2012 - 10:30 PM

Could you just use a 1" rubber washer sandwiched between 2 3/4" washers for the plunger head?


I actually tried this in an NF just to see how it would work, I got a pretty damn good seal. I used 7/8" washers instead of 3/4" which were perfect.
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