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Longshot Bolt to Plunger Tube seal


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#1 MAV13

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Posted 23 September 2013 - 02:25 PM

At some point, without me noticing, the o-ring that usually does a decent job of sealing the bolt to the plunger tube got pushed up from the little groove it rides in and shredded by my brass breech. The blaster still appears to be working fine, but I'm going to be opening it up for some maintenance in a few days anyway, so I wanted to know if anyone had come up with an alternative way to seal the bolt to plunger tube connection or if anyone knows the dimensions of said o-ring.

I saw the one posted a few months ago where you line the exit hole of the plunger tube with brass to seal with the bolt but that would require me disassembling my bolt (i.e. snapping the plastic nub off and ruining my brass).

EDIT: Disregard this thread, after further thought I realized there's really no way to get anything down in that gap without disassembly.

Edited by MAV13, 23 September 2013 - 02:33 PM.

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#2 CoolpantsMcgee

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Posted 23 September 2013 - 04:29 PM

I would suggest a craft foam seal along with the o-ring.
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#3 T da B

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Posted 23 September 2013 - 07:38 PM

If you get rid of the black piece that you glue to the back of the breech, you can remove the breech from the plunger without destroying the attachment nub. Since my nub is brazed on by a blowtorch, I have no choice but this route. I filled the dead space with padding, and the brass is plenty strong enough to prime the plunger rod by itself. I'm literally tackling the same sealing problem right now, since my brass/plastic (breech/PT) seal has degraded over time, and my perfect seal is gone. I will be sanding out the hole at the front of the plunger tube and gluing in a piece of 5/8'' brass to slide over my 19/32'' breech.

Hope this helps!
~T
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Make it funky.


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