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oxymoron
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    The AS-4: BBUMB/Rapidfire integration

    Jeo
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    Post  Jeo Tue Sep 13, 2011 9:27 am

    Howdy all!

    First up I want to give credit to bakabill 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 here 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, but I am happy to answer any questions.


    So to kick off with, we have an AS-20.
    The AS-4: BBUMB/Rapidfire integration DSCN2578

    Removed the outer shell.
    The AS-4: BBUMB/Rapidfire integration DSCN2579

    Removed the inner shell.
    The AS-4: BBUMB/Rapidfire integration DSCN2580

    Close up of the internals for anyone who's interested
    The AS-4: BBUMB/Rapidfire integration DSCN2581

    The AS-4: BBUMB/Rapidfire integration DSCN2582

    Inner shell with all of the components removed.
    The AS-4: BBUMB/Rapidfire integration DSCN2583

    First phase of dremeling.
    The AS-4: BBUMB/Rapidfire integration DSCN2584

    First mock up of how it will sit.
    The AS-4: BBUMB/Rapidfire integration DSCN2586

    The stock release valve/now the BBUMB tank refill button.
    The AS-4: BBUMB/Rapidfire integration DSCN2587

    Where the tank will fit + the start of the RSBC.
    The AS-4: BBUMB/Rapidfire integration DSCN2588

    Moar cutting!
    The AS-4: BBUMB/Rapidfire integration DSCN2589

    Tank with the check valve attached.
    The AS-4: BBUMB/Rapidfire integration DSCN2591

    Right, I apparently missed a few photos here but you get the idea. Reducer on the front to the t-piece + 30cm of PETG to make the barrel, PVC pipe from the back to the t-piece to the back of the blaster, small hole cut to accommodate said PVC, screw fitting to close off the back of the RSBC.
    The AS-4: BBUMB/Rapidfire integration DSCN2604

    The AS-4: BBUMB/Rapidfire integration DSCN2605

    Still need to figure out what I'm going to use to cover the barrel as I'm not a fan of the exposed/fragile PETG. Tossing up between just slipping over another piece of PVC pipe and painting it black to match the colour scheme, or whether a recon barrel extension would look any good.

    Ranges are what you'd expect from from a BBUMB; consistently hitting 30m. The cool part however is that I'm getting that range with 4 darts, in the space of 3 seconds
    clunk07
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    Post  clunk07 Tue Sep 13, 2011 11:41 am

    Nice work there mate.

    Maybe a pic of the trigger to tank piston connection would make things a bit clearer for the less experienced.

    Wish I had of kept one of my RF20's now... haha

    Cheers,


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    oxymoron
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    Post  oxymoron Wed Sep 14, 2011 8:04 am

    Freakin sweet!


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    Post  bakabill Wed Sep 14, 2011 8:41 am

    Great work!

    I don't own a RF20 but if there was a way to retain use of the turret it would be beyond awesome - even if it had to be rotated manually XD.
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    Post  night stalker Wed Sep 14, 2011 2:01 pm

    I did it a wrong way ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh. Its just you might be better than me at moding.
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    Post  Jeo Wed Sep 14, 2011 2:35 pm

    Cheers guys! I'll get some internal pictures of the finished product up soon enough.


    bakabill wrote:I don't own a RF20 but if there was a way to retain use of the turret it would be beyond awesome - even if it had to be rotated manually XD.
    I'm sure it's possible but it would take some pretty ingenious packaging of the tank as a decent chunk of it fits where the turret did.


    night stalker wrote:I did it a wrong way ahhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhhh. Its just you might be better than me at moding.
    As in you gave this a go yourself and it's not working? Any idea where you've gone wrong/any pictures?
    Jeo
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    Post  Jeo Tue May 08, 2012 2:47 pm

    Whoops, been a while. Full post now onFoam Dart Goodness yet I haven't updated here... Lets fix that!


    Where it's at currently...
    The AS-4: BBUMB/Rapidfire integration DSCN3885-2

    The tube from the fill valve at the bottom leads to the stock BBUMB check valve.
    The AS-4: BBUMB/Rapidfire integration DSCN3884-2

    The AS20 trigger is attached to stock lever from the BBUMB.
    The AS-4: BBUMB/Rapidfire integration DSCN3886-2

    It's then sprung to pull the trigger back and to close the tank.
    The AS-4: BBUMB/Rapidfire integration DSCN3887-2

    I took the whole post that originally held the lever in the BBUMB too. Made things much easier.
    The AS-4: BBUMB/Rapidfire integration DSCN3888-2

    Trigger in it's natural position.
    The AS-4: BBUMB/Rapidfire integration DSCN3890-1

    Trigger pulled.
    The AS-4: BBUMB/Rapidfire integration DSCN3891-1

    The trigger has been removed in this photo so you can see the slot I had to cut in the bladder tank.
    The AS-4: BBUMB/Rapidfire integration DSCN3893-1

    This random orange thing was glued in the bottom of the shell as a stopper for the bladder.
    The AS-4: BBUMB/Rapidfire integration DSCN3894-1

    See! Here it is with the bladder fully expanded, hard up against the stopper.
    The AS-4: BBUMB/Rapidfire integration DSCN3895-1

    I had to do this so that it didn't interfere with the trigger mechanism.
    The AS-4: BBUMB/Rapidfire integration DSCN3896-1

    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.
    The AS-4: BBUMB/Rapidfire integration DSCN3885-2

    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!
    Acerised
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    Post  Acerised Tue May 08, 2012 3:01 pm

    One word, WOW.

    I love how it functions. Good job!

    Try a hopper Clip!
    littlebro05
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    Post  littlebro05 Tue May 08, 2012 4:05 pm

    You and your hopper clips. It won't be clean anymore though with a hopper clip though. I like how it's all streamline. Sounds solid as well. Nice work Jeo. Le-sexy nerf blaster. Probably needs a dart door though for quicker loading.
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    Post  clunk07 Tue May 08, 2012 6:03 pm

    I'd forgotten all about this... one day I'll replicate it, as I have all the parts lying around

    It would be nice to see it with the Recon barrel....

    Nice work as always mate!!

    Cheers,


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    Post  Acerised Tue May 08, 2012 11:41 pm

    Was only a suggestion to avoid the flicking and have faster rate of fire.
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    Post  littlebro05 Wed May 09, 2012 12:43 am

    Acerised, you know we have this feud about RSCBs vs Hoppers all the time.

    A hopper on this blaster would be very interesting though. I think Coop on youtube made a big blast version of this, except he's got an HPA tank on it. Maybe that's what you need Jeo? A massive backpack air tank :D. I think that would be an interesting addition.

    I think the amazing thing in this blaster design that it looks almost completely stock
    Acerised
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    Post  Acerised Wed May 09, 2012 1:36 am

    Ahahaha LB.

    Out with the old and in with the new!
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    Post  Jeo Wed May 09, 2012 6:33 am

    Cheers guys.

    My understanding of hoppers was that they only liked shorter darts? We only use stock darts in Canberra.

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    Post  clunk07 Wed May 09, 2012 6:44 am

    Jeo wrote:Cheers guys.

    My understanding of hoppers was that they only liked shorter darts? We only use stock darts in Canberra.


    If you make your own wye, then you can decrease the angle of the feed so that full length darts will work.

    Personally, I think it wouldn't look real good on this - I like it fine how you've made it!!

    Cheers,


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    Post  Acerised Wed May 09, 2012 6:51 am

    Jeo, to a degree yes with US Wye fittings. The degree of the angle is approximately 45 degrees, which allows the use of short darts but Im not sure with streamline length darts.
    The bend may be too steep for the stock dart too slide through.

    However homemade Aussie Wyes are around 30-35 degree angle to accommodate streamline length darts. Works flawlessly.

    The AS-4: BBUMB/Rapidfire integration Oqd7ww The AS-4: BBUMB/Rapidfire integration 34930ya

    The picture to the right has a 30degree set square for reference.
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    Post  Jeo Wed May 09, 2012 7:04 am

    Cool.

    Wouldn't do it on something like this but will now have a go at one for something else.

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