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Old 04-08-2012, 11:45 PM   #7931 (permalink)
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Originally Posted by Timber_Ghost View Post
My thumper has worked flawlessly since the polish job. Before it seemed like no air was getting into the gun.

Can someone post some pics of the oring mod that was supposed to increase efficiency? Im getting 28 shots per 12ie at 270 and I'd love to get 30 or more.
It isn't a "mod" per se as there's already a groove for it, it just has to be added. When I'm down at the shop tomorrow I'll ask what size.

But here is where the o-ring goes:



That's the front of the cap behind the breech, there should be a groove around it.
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Old 04-09-2012, 12:26 AM   #7932 (permalink)
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So how does the new piston work?? Good to go, or still a work in progress?
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Old 04-09-2012, 01:39 AM   #7933 (permalink)
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Should be there for us tomorrow so we can test it.
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Old 04-09-2012, 08:20 AM   #7934 (permalink)
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Oh, I get it! That oring forms a better seal when the barrel is at rest, equaling in better efficiencies, and maybe higher velocities?

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Old 04-09-2012, 03:11 PM   #7935 (permalink)
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Quote:
Originally Posted by splattttttt View Post
Oh, I get it! That oring forms a better seal when the barrel is at rest, equaling in better efficiencies, and maybe higher velocities?

http://www.mcarterbrown.com/gallery/...08_2042131.jpg
I was told by Brian that all the new ones out of the factory are coming w/ that o-ring installed, and that it was one of the major reasons that so many people had velocity issues... I have not been able to verify this claim as I still don't have mine back.... but that's just a whole other issue.
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Old 04-09-2012, 03:30 PM   #7936 (permalink)
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That's exactly the reason Jack, Brian told me he was seeing a velocity jump as high as 50-60 FPS just from adding the o-ring. He didn't say what kind of shot count differences there would be, but he did say he expects an efficiency rise.
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Originally Posted by El Pato Diablo
Kinda scary how someone in a bright red hawaiian shirt can sneak up behind you like that, huh.
Quote:
Originally Posted by MCB CHAT
[20:54:32] <Walking_Target> Kinda awesome, you walk in and there's the giant black dildo right in front of the register
[20:54:33] <thisissparta> it's AWESOME.
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Old 04-09-2012, 03:32 PM   #7937 (permalink)
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Awesome, now let's get those Thumpers upgraded!
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Old 04-09-2012, 03:34 PM   #7938 (permalink)
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Yep, waiting on mine. I hope to have it, and any goodies for my other one, back by Supergame.
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Old 04-09-2012, 06:33 PM   #7939 (permalink)
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Quote:
Originally Posted by LilShank View Post
That's exactly the reason Jack, Brian told me he was seeing a velocity jump as high as 50-60 FPS just from adding the o-ring. He didn't say what kind of shot count differences there would be, but he did say he expects an efficiency rise.
Funny thing is when I first saw the piston housing with the groove and no oring, I asked my self... Why not? Lol.
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THE-SHOOTIST Anyone chubbin' like me for this?
mailmanmike Since Monday! That's more than 4 hours though, so according to those cialis ads I should see my doctor.
tlane77 I think for a non-chemical chubby it's 6 hours before its time to see a doctor. So you should be good for another couple hours.
splattttttt I wasn't goin to google "chubbin" because I assumed it had to do with fat. The lard type, not the fun stuff. But what ever feelings Jeff's experiencing, then they must be of the fun like stuff...
tlane77 He's got a woody for your woods.
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Old 04-09-2012, 07:09 PM   #7940 (permalink)
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i can't say i saw jumps in fps that high when i got mine back. granted i was using hpa and had to settle for 260's fps since anything higher i got nasty barrel breaks. didn't really see a huge increase in fps or a top to the velocity adjustment.
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