Oils for marker??

the first orings were made of rubber ...

Buna is now the most commercially available and cheapest material for orings , so its a safe bet most applications using orings are of Buna-n material unless there's a reason for some other material being used .

For the rest of your questions ,,, Read on my good man !! 

TIPPY98ACT wrote: Hey Bruce and shadowminion, thanks for opening my eyes! Last night at work I went into the shop and found one of our copies of the McMaster-Carr catalog. I read the o-ring explanation section and found that most o-rings are not effected by oil based lubricants. Go figure? My question is what type of o-ring do you guys think Tippmann uses in their guns? I found that Buna-n is one of the most widely used o-rings for it's ability to resist petroleum-based oils, hydraulic fluid and non-aromatic solvents. It has high abrasion resistance. Also temperature range is from -65 to +275 degrees Fahrenheit. Sounds like something you would want in a paintball gun right? Then I read on and found Viton and Polyurethane, Neoprene, Kalrez, Teflon, Silicone and even Ecapsulated o-rings. Most have the features you would want to have and some that you don't! So what one do you think they put in the guns? I really want to know what you guys think? On a fun note, I asked ten different people on my shift (ages between 30 to 54) what they thought about petroleum based lubes on rubber and plastic and they all suggested it was a bad idea! Where do think this theory came from?

Buna-N and Neoprene are the two most commonly available in the kits I have.

What is really funny about your "survey" is that "O" rings were originally developed to seal petroleum oils in equipment and engines.