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  #31  
Old 03-07-2007, 03:14 PM
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pbgrandpa pbgrandpa is offline
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Default Re: Grandpa's work in progress

Well I put some paint thru it today. It did surprisingly well considerering the short barrel. Not as loud with the paint as compared to dry firing. Accuracy is decent considering, but nothing to write home about. It handled all modes of firing and no ball breaks(yeaaa) more to come
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  #32  
Old 03-07-2007, 03:31 PM
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DRAGON DRAGON is offline
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Default Re: Grandpa's work in progress

The efficiency will go to hell with that short barrel. The ball has no time to reach velocity(6" HP 8" LP) so to compensate you'll have to increase the volume of pressure to reach a decent velocity. It's a similar affect with longer barrels but a bit different. The extended drag requires more pressure volume. If the barrel has no porting, once the ball reaches a certain distance(don't have the scientific data) rather than a push, the ball creates a suction which slows it down. More volume is required to compensate for the suction -
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  #33  
Old 03-08-2007, 09:15 AM
STRIKEFIRST STRIKEFIRST is offline
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Default Re: Grandpa's work in progress

You do good work captain!

Hmmm...I hadn't thought about a milsim project before...Maybe after my GZ restore!
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  #34  
Old 03-08-2007, 08:29 PM
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pbgrandpa pbgrandpa is offline
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Default Re: Grandpa's work in progress

Quote:
Originally Posted by DRAGON
The efficiency will go to hell with that short barrel. The ball has no time to reach velocity(6" HP 8" LP) so to compensate you'll have to increase the volume of pressure to reach a decent velocity. It's a similar affect with longer barrels but a bit different. The extended drag requires more pressure volume. If the barrel has no porting, once the ball reaches a certain distance(don't have the scientific data) rather than a push, the ball creates a suction which slows it down. More volume is required to compensate for the suction -
I understand what your saying. But I'm not having a problem reaching a decent velocity, it's to much velocity. It's shooting way to hard.I know in theory it doesn't make sense. I have a spring kit on the way and plan on some more tuning when it arrives. As far as efficiency goes i haven't shot it enough to really tell.
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  #35  
Old 03-19-2007, 11:33 PM
lilc lilc is offline
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Smile Re: Grandpa's work in progress

Quote:
Originally Posted by pbgrandpa
...SMG 3" barrel....and the M4 stock from RAP4(which i don't recommend)had to modify it to fit good.
Love the shorty barrel. I use an End Game Stub Nose 3-incher on my Tippmann A-5, and it's cool.

Yeah, I prefer the APP Hittmann M4 car-stock for Spyders. It fits the MR1 really nicely, has four positions, and has a built-in tools-free rear velocity adjuster for $40-$60 depending on vendor. The sad part is that out of the box the RVA doesn't actually work properly, and you have to do a cheap DIY mod to fix it. Once you do, it's a very sweet (and convenient) setup...

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  #36  
Old 04-06-2007, 09:22 AM
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pbgrandpa pbgrandpa is offline
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Default Re: Grandpa's work in progress

It's now VS3 Sniper's work in progress. He bought it. I'm sure he'll post up some more pics.
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