Mod Shop – AS4 – BBUMB/Rapidfire intergration

Good evening ladies and gents. Another advanced mod today and not so much of a walk though. First up I want to give credit to Bakabill on OzNerf for his semi auto Magstrike that provided the original inspiration to have a go at this (and in a round about way, I should probably mention Banshee’s Blast-Strike on NH and Lefty’s Mega-Strike too).

Basically my situation was that I’d seen Bakabill’s Magstrike write up and thought it was worth a crack, then realised I had a only somewhat reliable Rapidfire AS-20 sitting at the bottom of my Nerf cupboard. Thought about it for a day or two and decided bugger it, I’ll just pick up another BBUMB and give this a go.

I’m not going to go into any real detail with this as it should be fairly self explanatory for those who know what they’re doing, but I am happy to answer any questions.

So to kick off with, we have an AS-20.

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I started by removing the outer black shell.

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Then the inner yellow shell.

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This valve here is what we will use for the BBUMB tank refill button.

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Strip the shell and Dremel away until the tank fits.

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Move to the bottom of the blaster and cut a slot for the refill button.

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Put the back bladder/pump assembly back in and test fit the fill button.

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Like so.

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Test fitting the main tank and the T-piece for the RSBC.

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Cut the smaller tube to an acceptable length and re-attach the check valve.

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OK, I kinda skipped a few steps here but you’ll get the idea. Photobucket

The tube from the fill valve at the bottom now leads to the stock BBUMB check valve. Photobucket

The AS20 trigger is now attached to stock lever from the BBUMB.

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It’s then sprung to pull the trigger back and to close the tank.

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I took the whole post that originally held the lever in the BBUMB too. Made things much easier.

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Trigger in it’s natural position.Photobucket

Trigger pulled.

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The trigger has been removed in this photo so you can see the slot I had to cut in the bladder tank.

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This random orange thing was glued in the bottom of the shell as a stopper for the bladder.

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See! Here it is with the bladder fully expanded, hard up against the stopper.

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I had to do this so that it didn’t interfere with the trigger mechanism.

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That’s about it in a nutshell. The barrel is 300mm of 17/32 brass, the back half of the RSBC holds 4 darts, there’s a screw on end cap on the end.

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So how does it all work? From the top;

Unscrew the end cap, insert 4 darts, screw it back on.
Pump 10-15 times.
Press the fill button at the bottom (fills the BBUMB tank from the AS20 bladder).
Flick the front of the blaster towards the ground (gets another dart jammed in the barrel).
Pump 10-15 times.
Pull the trigger to fire (opens the BBUMB tank).
Press the fill button, flick the front of the blaster towards the ground, pull the trigger to fire.
Press the fill button, flick the front of the blaster towards the ground, pull the trigger to fire.
Press the fill button, flick the front of the blaster towards the ground, pull the trigger to fire.

Tada! Start at step 6 and you can fire 4 darts in 3 seconds, each hitting ~30m flat. Check the video below for an example (albeit nice and slow so you can see what’s going on).

FB Video – Canberra and Southern NSW Dart Tag

(I tried so many times to get that to embed, nuts to that you’re getting stuck with a link)
PS: ‘Like’ the page!

Cheers all,
Joe

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