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 Post subject: Small or Large Piston
PostPosted: Wed Aug 29, 2018 6:40 am 
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Joined: Fri Jan 25, 2013 9:51 pm
Posts: 253
Location: Dryden, Ontario
Does anyone know if this piston is the short one or the long one before I order for my phantom 500...I want the short one.https://store.gravelagency.com/gaen/b18 ... -100a.html


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PostPosted: Wed Aug 29, 2018 8:59 am 
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Joined: Fri Jul 27, 2018 10:34 pm
Posts: 284
Location: Bowmanville, Ontario
You should be able to look up the part number on crosman website. Or email Chevota. Jeez. He knows everything about Crossman parts.

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Fully rebuilt Benjamin .22 classic
Some other junk rifles


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PostPosted: Wed Aug 29, 2018 10:35 am 
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Joined: Fri Jan 25, 2013 9:51 pm
Posts: 253
Location: Dryden, Ontario
Carpenter84 wrote:
You should be able to look up the part number on crosman website. Or email Chevota. Jeez. He knows everything about Crossman parts.

Thanks, I was finally able to reach my Crosman contact in T.Bay.This is the right part number.


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PostPosted: Wed Aug 29, 2018 2:32 pm 
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Joined: Mon Aug 26, 2013 12:19 pm
Posts: 82
Location: Alvinston, Ontario
Chevota knows springers. Following his advise, everone became a better and more consistent shooter.

Sent from my LG-M703 using Tapatalk


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PostPosted: Wed Aug 29, 2018 8:02 pm 
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Joined: Sat Jan 25, 2014 9:16 pm
Posts: 1233
Location: United States
I'd opt to cut the long one down, especially considering the $ of that new one, but up to you.
Attached is a pix of a fellow members cut job who was kind enough to share. Plus a pix of a full power piston and it's #'s fyi. These should explain it well enough but I can answer Q's if you have any.
The hole determines how far back the piston sits when cocked, the further back the more stroke, more stroke = more power. It can only go so far back due to several factors but you should be able to squeeze a little more than a normal full power short piston if you want to try. If so then move the hole a couple mm further fwd than the pix measurement and see if it works. If too far fwd the trig sear can't catch the hole so you simply grind the hole further aft until it does work. Drilling the hole bigger does the same thing, as long as the hole isn't too close to the cocking linkage slot bc the link pushes on the aft end of that slot to cock the gun.
It's kinda a pain since you have put the gun together to check, but it's the price you pay if you want that extra bit of juice. Basically each mm is worth ~1% power, but some people will work hard for that little bit. Inversely the hole in the long piston is way back which is why it has so much less power.
You should also bevel and round the cut edge of the skirt so it can't scrape your tube, and ideally put buttons on it as well so there's no metal to metal contact. Buttons also make cocking smoother and easier.


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