Material for Air Rifle Breech Seal

[FOM]

I tried to order several breech seals for my old HW30S (same as Beemans R7 and other Weirauch made air rifles). Weirauch promptly replied with Beemans contact info and I call Beeman. 3 seals and shipping total they said was $13.37, but then I was informed by Beeman that there was also a minimum order charge of $50.:( So...I can probably make them myself if I know what to use. Any one out there that can tell me?
As a side note, I really am pressed for time, and would rather just order them, but I can't find any suppliers online or phone numbers of suppliers. If you know of one, please let me know.
By the way, I really do enjoy this forum...it alone is worth the subscription price to HSM&MW.:D

[moe1942]

Just use an O ring which you can get locally.

[Yankee1]

Hi
Give Tim Mac Murray a call at Mac1 in Los Angeles. His #is 310 327 3581
He runs a very good air gun business and will take care of your needs reasonable.
Yankee1

[FOM]

Thank you Yankee1. I have e-mailed Tim and requested costs and availability.
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I still would like to know what simi-hard "plastic" is used to make them. They are cylinder shaped and the groove is too, instead of donut shaped, So I could probably make one.

[Yankee1]

He is extremely knowledgeable on the subject of o-rings. He may suggest a superior material.
Yankee1