Fx crown barrel oring issue

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Yes same as the Impact. Check when you install/remove the barrel it isn't nicking the oring. If it does air will escape and the gun will get louder. 
This may have happened before it cut it completely. 
Lube the oring with silicone and as they come up against the receiver just twist a little left and right until they enter the receiver. 
I use same size but nbr 90 on my Impact just because they are a bit stiffer but probably doesn't make any difference. 
Good luck. 
 
"AirSupply"Yes same as the Impact. Check when you install/remove the barrel it isn't nicking the oring. If it does air will escape and the gun will get louder. 
This may have happened before it cut it completely. 
Lube the oring with silicone and as they come up against the receiver just twist a little left and right until they enter the receiver. 
I use same size but nbr 90 on my Impact just because they are a bit stiffer but probably doesn't make any difference. 
Good luck. 
Thank you.very much for all the info. You're the best 
 
"jlc"I bought a whole case of various types of O rings, they are on a pegs with sizes etc. from Amazon, about 20 dollars.

I have used two or three for other things none for the guns yet.
in my experience(10years+ on vacuum equipment) generic o rings kits are useless, there are too many norms, sizes and you have to be lucky to find a match.
it is better to order 10-20x pieces of exact sizes only those who one needs, typically you just need 3-5 different sized one to keep a typical PCP going for years.
no need to buy full kits either. change only the one which needs changing.