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ShadowMan 03-21-2013 01:29 AM

Reviving an old horse
New to this board, but not new to PB, however it's been a long time since hitting the field. How long? Well back in its infancy when the ONLY choice you had for propellent was CO2 cartridges. :old:

Well, last weekend I got a blast from the past while out garage sailing and found an old Sheridan P.M.I., which when I asked the seller about the old Paintball "GUN" she simply gave it to me....cause you know that paintball guns are evil and she practically demanded that I take it away. of course I obliged her request and took it home.

Gave it the once over and cleaned up years of sitting in someone's garage or attic and was wondering what I needed to do to bring this old horse up to full operational speed?:drool:

Brassballs 03-21-2013 05:02 AM

good job helping her out!
you should post a picture of it... upload a picture to photobucket or imageshack then use the image code to post it on here.

It might not need anything other than air tool oil ran though it and maybe a few o-rings?
odds are it doesn't have a velocity adjuster on it so that is something you should look into if your wanting to play with it.
to bring it up to date,a valve tune will give you more shots per 12 gram.

air it up and give it a try!


ShadowMan 03-22-2013 11:34 AM

Sorry for the lack of pic's. Had to figure out new phones quirks, but here they are:
The only thing that obviously needs to be replaced are the plastic pistol grips - they're cracked nearly in half. I figure that the O-rings and any seals will also have to be replaced. Not sure just which ones or sizes to order but I'm sure someone here on the boards can point me in the right direction. I'd also like to know what tricks and mild customization to the working guts to improve its performance and reliability. Perhaps polish the inside of the barrel? Polish the bolt? Perhaps a little bit of custom work?

Not sure, but I think I'd really like to keep it as original as possible, so I'll probably keep it as a cartridge gun vice convert to cylinder powered. Polish up the brass, wood grips....maybe a laser and optics?:rolleyes: I do like the polished brass look. Ideas? Advice? Suggestions? Warnings?

Oh and BTW does anyone have any idea when this marker was probably made?

B-17 03-22-2013 01:45 PM

What you have there is a shiny PMI-I.
I am curious to see if the seals still work, I picked a minty PMI-I up off a guy from texas, and he had just put the gun away for 20 years in his drawer.

It still hasn't let me down.

As for the barrel plug, I believe that's a Cooper-T product. Don't ever throw it away/lose it.

As for work - I honestly wouldn't do anything but clean the barrel with a squeegee or a paper towel and some brasso.

babshaft 03-22-2013 01:48 PM

For o-rings and the like you have a few options. You have palmer's pursuit (google and you'll find their website), short304, or MaD - both are on this forum. I love short304, excellent guy to deal with, but in this case I'd recommend MaD as his seal kit has EVERYTHING needed to get her running at the best price. Plus he's an excellent fellow. Search him in the member directory an shoot him a PM.

If you're looking to use 12 grams and want the best deal on a lot of them search Titus - also an awesome dude.

The more knowledgeable guys will answer your other questions. Hopefully this helps.

Brassballs 03-22-2013 05:01 PM

It looks like it's good to go.
if it holds air there no reason to replace the o-rings/seals unless for peace of mind knowing they're new.try MaD.

if you feel the need
here's a good cheap way of making a valve tool


The biggest thing you can do to it to make a difference would be getting/doing a valve job to'll gain around 10 more shots per 12 gram.
it requires the gun and valve and body to be drilled and sometimes soldered on a tiny bit.
there's people on here that can do this for,WALZ,MaD,chipnstone.....palmers does too but they are $$$$

and making/buying a velocity adjuster.

I think the delrin pump handles are smoother than the aluminum ones.

that's the basics/

Axel 03-22-2013 05:40 PM

Brassballs and babshaft ate right on the money. I would just add detents, to stop rollouts and double-feeds. Palmers can do wedgits, a couple small dents in the breach, and also sells a kind of clip with a head on the end. The wedgits, and I think the second kind as well, require you to send the gun out to be modified. I have been having experimenting with hanging a bit of fishing line into the breach, with promising results, although I think its hurt my efficiency a bit. There's a thread on this forum about homemade wedgits as well, and the classic DIY fix is a couple dabs of clear nail polish at just the right spot.

That is an excellent find, by the way, with several nice upgrades already, especially the fassst changer.

Brassballs 03-22-2013 07:35 PM

RED fingernail polish works way better than clear.;)

if you use balls that don't roll out of the barrel you don't need wigets/dents.
OP, alot the balls made nowadays have gotten a little bit smaller than the barrel on sheridans..686-.687 barrel ID.
you can still find ones that fit them good. .688+ is a nice tight fit

ShadowMan 03-22-2013 08:06 PM

Hey! Thanks for all the help and AWESOME info!!:bowdown It's very much appreciated.

Well....I got everything cleaned up and reassembled. Dropped in a CO2 cartridge and some reusable .68 caliber rubber paint balls and gave it a go. Hmmmmm got off about 20 shots, not too bad on the accuracy but there is definitely some work that needs to be done on the seals. I could hear a small leak right off the bat. It calmed down after a few shots and I thought that if I was lucky maybe it was just some grit that was blown out or something. No luck, the hissing sound of a slow leak came back after a few more shots.

I might only need to pull out the guts and clean them, but then again I might as well replace the seals and O-rings while I've got it apart. BTW, what is a reasonable target range on this model of splatter gun? It's been so long since I've played that I don't really remember. I had no problem (even with the slight leak) accurately pegging the same board on the backyard fence, say....70 to 75 feet away with MoM (Minute of Man) accuracy :huh: before the pressure dropped off and the cartridge was spent. Had to loft it a bit but the little rubber balls hit hard enough on the cedar boards to bounce half way back across the yard. Pretty sure it would hit hard enough to pop a real paintball. Actually left a nice little round mark on the woods weathered surface (hope the wife doesn't notice:rolleyes:).

snaparen 03-22-2013 09:36 PM

Where is the leak coming form? Under the grip, or down the barrel? That will tell you what seals are bad.

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