Replaced Plunger Tube Disc Shot...
#1
Posted 21 January 2010 - 06:53 PM
So, I cut the pump head off at the seam:
And I plan on putting it on the plunger rod with the back portion of the plunger head. I did this because I don't know if the weak plastic of buzzbee could handle any decent spring.
Now, to the plungertube... This is where I am questioning...
As you can see, the plunger tube can extend to the full length of the gun, I don't want any of the plunger tube outside the gun. Trying to keep this clean.
Now, the walls are in the way on the end. No big deal there, I would chop them off even if I was doing a normal extended draw. So far so good right?
But then I realized I had no idea how to attach a barrel or coupler... I was thinking of putting in a piece of pvc into a pvc coupler so that some length of it could go into the plunger tube. I would then wrap this in E-tape until it fit snug... but that's no small amount of electrical tape. I don't know how that would work, since only one outer layer of electrical tape would be glued to the tube, and I would guess that after a number of shots it would unravel. I plan on putting in a full length replacement nf spring, so about an inch more than a normal length nitefinder spring, nothing crazy. I would to see if this is the general idea of what to do next before I do something stupid.
#2
Posted 21 January 2010 - 07:02 PM
and post results.
If you dont want to, fine.
But I think this is very interesting and would like to see results.
Edited by flamingeyes245, 21 January 2010 - 07:03 PM.
And your Nerf guns closer.
External Modification contest, check it out!
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#3
Posted 21 January 2010 - 07:06 PM
Pics are on page181 of mod thread
Edited by TantumBull, 21 January 2010 - 07:16 PM.
#4
Posted 21 January 2010 - 08:47 PM
#5
Posted 21 January 2010 - 09:02 PM
Hawkshot, one of the founding FL Nerfers.
#6
Posted 21 January 2010 - 09:21 PM
Edited by Cannonball, 21 January 2010 - 09:22 PM.
#7
Posted 21 January 2010 - 11:20 PM
1" reducing coupler (or 1" coupler + 1" slip bushing) might be too big to fit over the 4B pump tube.
Kruger and Dunning (1999)
#8
Posted 22 January 2010 - 03:01 AM
Edited by Blue, 22 January 2010 - 03:03 AM.
#9
Posted 24 January 2010 - 07:21 AM
Now for the plunger tube:
This is what I hope it will look like internally after a shot
And these are the screw I think I'll drill into the gun
Now, the plunger rod can go further into the shell, but the back stops it.
I think that lengthening the plunger rod would solve this.
I also think that if the length was added between the catch and plunger head I could fit a full Century 836 spring and not have to cut it down
Now, the gun gets maybe 30 flat with megas with the stock spring and the poor seal of pvc in electrical tape. I would like to know if lengthening the plunger rod to accommodate the spring is at all worth it, or if I should just finish off the mod and use a cut down one? Thanks.
#10
Posted 24 January 2010 - 08:34 AM
#11
Posted 24 January 2010 - 09:10 AM
Kruger and Dunning (1999)
#12
Posted 24 January 2010 - 05:36 PM
You should just cut down the shell so the plunger rod can move forward more.
That wouldn't do anything for the spring length though, the distance between the catch and the end of the plunger head is not long enough to fit the number of coils. Also, I would imagine the spring to be very rattley after a shot since there is so much extra room.
Hi Yah: Do those work on the buzzbee pumps?
#13
Posted 24 January 2010 - 07:19 PM
#14
Posted 24 January 2010 - 09:43 PM
Just don't put two in an actual 4B. 2 o-rings will negate the stock method of preventing a vacuum.On my bbbb's I use one #17 o-ring and my over pressure valve pops at 7 pumps. I figure 2 should give you a great seal.
#15
Posted 08 February 2010 - 12:20 AM
It closes up fine, and I have been getting maybe stock ranges with a larami in that stub of pvc. I have a CB spring in it. Anything stronger and it binds up and messes with the catch. I also think the plunger tube is not exactly straight, not sure if that means anything though. As far as fixing the catch, I plan on cutting out a circle or something and making a piece similar to the back plate of a PAS.
#16
Posted 08 February 2010 - 02:07 AM
I don't have a 4B pump or anything, what size of PVC would fit the stock plunger head? 1"?
#17
Posted 08 February 2010 - 02:22 AM
This is awesome, I've wanted to do a PT extended nitefinder for some time, but didn't want to butcher the shell. The disk shot shell is pretty much built to handle a longer plunger tube.
I don't have a 4B pump or anything, what size of PVC would fit the stock plunger head? 1"?
3/4" thinwall is a pretty good match. 1" PVC will not fit in the shell.
Kruger and Dunning (1999)
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