After a very prompt response from Johan at FX in Sweden. 500 Royale o-rings are

TrapdorSpydr · Feb 29, 2016

For the regulator
NBR 70
2.9 mm inside x 1.78mm cross section
6.07mm x 1.78mm
7.66mm x 1.78mm
11.6mm x 2.4mm

These convert to the stand AS568 chart as being..
006
010
011
???? there is not an equal. I just ordered a 11.5mm x 2.5mm

hsnmz · Mar 1, 2016

thanks for that very useful info

gixxer3000 · Mar 1, 2016

"TrapdorSpydr"For the regulator
NBR 70

11.6mm x 2.4mm
???? there is not an equal. I just ordered a 11.5mm x 2.5mm

They do exist in correct sizes, atleast at my oring dealer so just keep looking if the alternative dont work out.

AirgunBill · Mar 1, 2016

I have a Wildcat on order and was looking for the o-ring sizes to buy to have on hand in case there were any leaks. Like everyone I don't want to pay the inflates prices that air rifle sellers charge. It has been hard finding most of the sizes online to purchase. I think I will try converting mm to inches and see how close they come to US specs. Bill

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After a very prompt response from Johan at FX in Sweden. 500 Royale o-rings are

TrapdorSpydr

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hsnmz

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gixxer3000

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AirgunBill

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