Pump Rainmaker: Smoother Stroke?

DeTrevni · 05-17-2008, 04:55 PM

So, here's my latest setup:

It looks kinda goofy with that Sportshot on there, but the balance is absolutely PERFECT. Seriously, the center of gravity is in the middle of the frame, right between where my thumb and shooting finger would grip it. It weighs a ton, but I could one hand it without problem (if it weren't pump).

Anyway, it would be a beatuiful shooter if I could just smoothen the pump stroke. It feels like the aluminum pump arm is seizing against the brass guide collar. I keep the pump arm, the carrier and the hammer oiled. I was wondering if there was a better way to improve pump stroke.

Thanks for any suggestions!

Clearush · 05-17-2008, 08:22 PM

I like that stab sidelined like that, it really works.

hmmm delrin guide collar??

have you polished everything super smooth.

DeTrevni · 05-17-2008, 10:34 PM

Not yet. I'll probably do that. And thanks.

Rainman229 · 05-18-2008, 05:15 AM

Marty mods. Are the only thing I could thing of that might help.

DeTrevni · 05-18-2008, 06:46 AM

The dern thing has every Marty Mod that is feasible on this, from internals, to fitted bolt to stainless screws. Heck, the entire back block is a Mad Marty custom assembly. Well, at least the rear cap and bottom half of the block are. I replaced the gutted LPR block with a not gutted one to decrease volume. Seems to have really helped with my previous velocity troubles.

Rainman229 · 05-18-2008, 05:37 PM

Not sure if adding a guide rod is feesable or possible

DeTrevni · 05-18-2008, 09:33 PM

I was pondering that. A pump guide rod could be fitted to the front frame adaptor. It would require a new pump handle though. Want me to draw up a sketch? It would probably help quite a bit. I'll draw it up. See if I can talk you into it.

HurtCow · 05-19-2008, 03:24 PM

Both of mine have that bindy feeling on the pump stroke. I just make sure not to side-load the pump, I pull it straight back.

Both mine also have the PPS Sideline Stab. Makes it very compact.

DeTrevni · 05-19-2008, 04:00 PM

It pumps fine (not buttery, but fine) when I put a little upward pressure on it. If I can figure out a good way to mount a guide rod, I think that will help it a lot.

OverKill · 05-22-2008, 09:13 AM

Try making a guide collar that is smaller (tighter tolerance) maybe if the shaft is .500 make the guide collar ID .499 +0-1 even 1 though can sometimes catch, though, your best bet is .0005 if you have a boring bar (and hopefully you know someone with a shop, or have one

and then polish the shaft, will be smooth as butter then. (or it should be, anyway

05-17-2008, 04:55 PM	#1 (permalink)
DeTrevni Post Whore Join Date: Sep 2006 Posts: 1,203	Pump Rainmaker: Smoother Stroke? So, here's my latest setup: It looks kinda goofy with that Sportshot on there, but the balance is absolutely PERFECT. Seriously, the center of gravity is in the middle of the frame, right between where my thumb and shooting finger would grip it. It weighs a ton, but I could one hand it without problem (if it weren't pump). Anyway, it would be a beatuiful shooter if I could just smoothen the pump stroke. It feels like the aluminum pump arm is seizing against the brass guide collar. I keep the pump arm, the carrier and the hammer oiled. I was wondering if there was a better way to improve pump stroke. Thanks for any suggestions! __________________ 36 people like me thus far, and none don't!

05-17-2008, 08:22 PM	#2 (permalink)
Clearush MCB Member Join Date: Mar 2006 Location: HTown, TX Posts: 1,405	I like that stab sidelined like that, it really works. hmmm delrin guide collar?? have you polished everything super smooth. __________________ Carter's Commando Texas division The White Board Comic My SCP Feedback Ebay Feedback MCB Feedback

05-17-2008, 10:34 PM	#3 (permalink)
DeTrevni Post Whore Join Date: Sep 2006 Posts: 1,203	Not yet. I'll probably do that. And thanks. __________________ 36 people like me thus far, and none don't!

05-18-2008, 05:15 AM	#4 (permalink)
Rainman229 A god in my own mind Join Date: Apr 2006 Location: nj Posts: 2,769	Marty mods. Are the only thing I could thing of that might help. __________________ Email lastone75@aol.com Making paintball fun again feedback http://www.mcarterbrown.com/forums/s...ght=rainman229

05-18-2008, 06:46 AM	#5 (permalink)
DeTrevni Post Whore Join Date: Sep 2006 Posts: 1,203	The dern thing has every Marty Mod that is feasible on this, from internals, to fitted bolt to stainless screws. Heck, the entire back block is a Mad Marty custom assembly. Well, at least the rear cap and bottom half of the block are. I replaced the gutted LPR block with a not gutted one to decrease volume. Seems to have really helped with my previous velocity troubles. __________________ 36 people like me thus far, and none don't!

05-18-2008, 05:37 PM	#6 (permalink)
Rainman229 A god in my own mind Join Date: Apr 2006 Location: nj Posts: 2,769	Not sure if adding a guide rod is feesable or possible __________________ Email lastone75@aol.com Making paintball fun again feedback http://www.mcarterbrown.com/forums/s...ght=rainman229

05-18-2008, 09:33 PM	#7 (permalink)
DeTrevni Post Whore Join Date: Sep 2006 Posts: 1,203	I was pondering that. A pump guide rod could be fitted to the front frame adaptor. It would require a new pump handle though. Want me to draw up a sketch? It would probably help quite a bit. I'll draw it up. See if I can talk you into it. __________________ 36 people like me thus far, and none don't!

05-19-2008, 04:00 PM	#9 (permalink)
DeTrevni Post Whore Join Date: Sep 2006 Posts: 1,203	It pumps fine (not buttery, but fine) when I put a little upward pressure on it. If I can figure out a good way to mount a guide rod, I think that will help it a lot. __________________ 36 people like me thus far, and none don't!

05-22-2008, 09:13 AM	#10 (permalink)
OverKill Rec Poster Join Date: Dec 2007 Posts: 33	Try making a guide collar that is smaller (tighter tolerance) maybe if the shaft is .500 make the guide collar ID .499 +0-1 even 1 though can sometimes catch, though, your best bet is .0005 if you have a boring bar (and hopefully you know someone with a shop, or have one and then polish the shaft, will be smooth as butter then. (or it should be, anyway

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