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Forward-facing Bbbb Pump

Knock-off SM1.5k

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#1 Zorns Lemma

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Posted 24 July 2009 - 05:12 AM

A significant disadvantage to the 4B is that pumping requires you to move the gun away from a firing position. One way to solve this is to buy a SGSL. Here's the other.

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The pump is just an At3k pump that is fitted into the front handle, and the tubing is routed into the tank. A ball pump will be even better, as the stock 4B pressures aren't that high, and the ball pump will fill up in 1 or 2 pumps.

To route tubing into the 4B, slowly drill in a hole. I used the grinding bit on a dremel to cut out most of the material, then took a knife to the area while holding the tank up so that the plastic fell out of the tank rather than into the tank. If you do get plastic into the tank, you can flush it out with water, and then just set it aside to dry for a while.
Then shove in 1/4x1/8 vinyl tubing and superglue it on. Add seal and strength by slowly layering on goop, as a large amount of goop on at one time takes forever to cure. I went with 3 layers, the first 2 4 hours apart, and the 3rd one 24 hours after.
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Hack up your shell so the pump will fit and then add scrap foam to take up space before hotgluing it all together.
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And now you can pretend to have a SM1.5k (provided you pick up a turret somewhere):
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#2 Mr BadWrench

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Posted 24 July 2009 - 05:51 AM

NOICE

don
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#3 flamingeyes245

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Posted 24 July 2009 - 07:51 AM

Nice! If you minimized the back, it would kinda be a pistol.
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#4 Echnalaid

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Posted 24 July 2009 - 08:02 AM

I'm not familiar what an SGSL is. Can someone clearify for me?

Edited by Echnalaid, 24 July 2009 - 08:02 AM.

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#5 Zorns Lemma

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Posted 24 July 2009 - 08:32 AM

Nice! If you minimized the back, it would kinda be a pistol.


I keep the back on because a) the pump handle makes a nice stock and :o the At3k pump OPRV kicks in 2 pumps before the BBBB one, which doesn't matter, since it still breaks the century mark even with that air-inefficient turret, but, just in case, I can still use the stock pump to get that extra boost.

I'm not familiar what an SGSL is. Can someone clearify for me?


Spy Gear Signal Launcher.

It's the same tank as the 4B, but the pump is on the bottom, like a new-style SM1.5k or the RF20

Edited by Zorn's Lemma, 24 July 2009 - 08:36 AM.

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#6 white moonlight

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Posted 24 July 2009 - 09:13 AM

Does the pump move back and forth?

If it does you should secure it somehow in the most comforatable spot.
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#7 Nerf Bros

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Posted 24 July 2009 - 09:42 AM

So how many pumps are you at with that pump? I need to fix up my sgsl and a pump replacement might make it war usable again (25 pumps kills ROF).
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#8 Ice Nine

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Posted 24 July 2009 - 02:55 PM

Man, Zorn, that's one fucked up 1500 turr...

Hm.

Well, the AT3K pump looks like it's been through...

Hm.

I like it. Good job, man. We'll see how it compares to a real rear-loading 1500.
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