8 replies to this topic

[sparklefish123]

Hey all, my first modification Write-up. Many of you know the downsides to the old style 4B's. The tiny pump O-ring, length of the blaster, and some of you guys have trouble with your tanks sealing. I have fixes for all of these!
Materials:
Bandsaw/Hacksaw
4B
Beserker Pump
Spring to fit under the tank firing pin
Hot Glue Gun

Step 1:

Take you stock big blast and unscrew it. If you are minimizing which I recommend do whatever you want to that orange ring on the front, I cut mine with a dremel.
Step 2:

Cut the stock barrel down, and slap whatever coupler you want on. Then for reinforcement, add epoxy putty.

Let that set.
Step 3:

If you can see it, I added a small spring under the firing pin and glued it to the tank and pin. This spring pushes the O-ring up against the tank making pumping easier and much more effective.
Step 4:

Replacing the pump O-ring or whole pump shaft. A Beserker pump shaft is the same size of a 4B pump shaft. It is a little longer but big whoop. If you are using a Orange/White 4B as I am, I suggest either just replacing the O-ring with the Beserker's or the pump handle and put it on the Beserker pump shaft.
Step 5:

Minimization time! I highly recommend this as I said earlier. You may have to cut the hole in the center bigger for your coupler to fit, I used a CPVC one so it required very little effort.

And there you have it! You have repaired a 4B and made it spectacular! My ranges were outstanding and it took about 6-8 pumps for the OPRV to kick in. Before that, it took around 15.
Ranges:
93'
96'
91'
99'
102'
93'
Questions, comments, flames?

[SlightlySane813]

Nice write-up

I like what you did with the spring to help the tank seal completely.

One thing that was hard to notice was the spring placement because of the size of the pics. Try making them a little bit bigger next time.

Edited by SlightlySane813, 21 May 2011 - 12:30 PM.

[Langley]

Although it won't do anything to help the loading times for pages, and it takes a moment to kick in, the new forums software will automatically resize images for your screen. So no need to post tiny thumbnails that link to huge, table-breaking images.

[sparklefish123]

Although it won't do anything to help the loading times for pages, and it takes a moment to kick in, the new forums software will automatically resize images for your screen. So no need to post tiny thumbnails that link to huge, table-breaking images.

Good to hear, thanks for the feedback everyone!

[Gears]

This was actually an issue I have been having with my 4JAX. I'll be sure to use the spring/firing pin trick next tune up.

[LT DAN ICE CREAM]

This writeup is exponentially better than the last modification posted (lololol cram a brass barrel in the plunger tube lololol), even if most of what you've said has been done before. The spring by the firing pin is ingenious, and you should keep up the good work.

[andtheherois]

Good first writeup. Though I would suggest getting one of those $10 dual action pumps from walmart. Can't wait to see this at central conflict.

Edited by andtheherois, 22 May 2011 - 02:48 AM.

[0cool]

what form of ammunition were you using for your range tests?

USER WAS WARNED FOR THIS POST

Edited by Zorn's Lemma, 26 July 2012 - 08:40 PM.
necro

[Zorns Lemma]

what form of ammunition were you using for your range tests?

We prefer the term "darts" rather than "ammunition" since we play with "blasters" not "guns."

Furthermore, this thread is over a year old. Please reread the Code of Conduct and New Members Guide before posting again.