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[Skip in WV]

Crosman part number is 130-036. It is a square cut oring. Anyone know the dimensions, and where to second source them? Archer Airguns sells them, but is expensive.

[Bill G]

Skip,
You can always forgo the transfer tube and orings by using a pc of poly tube cut just a hair longer than the OEM. make sure its cut square.

[Skip in WV]

Thanks. I'll try that.

[Do99ie]

The best second source I've found for O-rings is "The O-ring Store" online. You may have to acquire a little knowledge on how O-rings are made, measured and sold, but once you get it you'll be able to order any type O-ring you need. As for the one you were asking about, it's a square-cut O-ring, called such because the sides and top/bottom are cut square. I don't remember the exact size of the one you're asking about, but the parts diagram and exploded view details all the specifications by indicating the actual part number and standard O-ring size. All you need after that is to know it's a square-cut O-ring. The O-ring store sells for very reasonable prices and you can order a bunch at once to save money. I buy all my O-rings from them.

[Do99ie]

If you don't have much success with the poly tube idea consider the possibility that the material expands and contracts quite a bit with temperature. Also there's a lot of heat generated in the transfer port area upon firing the gun. If you doubt that, just think about how dieseling can be done! The heat generated in the transfer port expands/contracts the poly tube material making it unacceptable and can cause a lot of variation in your extreme spread.