Are there Differences between a FWB 600 and 601's O rings ?

[bobby38555]

I have a FWB 600 and I see that a feller on ebay has a O ring & piston ring rebuild kit for the 601 for $ 39.00.

My Question is ,Are the O rings and piston rings the same on the 600 & 601?

I've had the 600 for several years now and it still shoots great but I got to thinking that Beeman may not have the ring rebuild kit for the rifle 10 or 20 years from now.

Thanks in advance for your input ! Bobby