Solution of FX royale 400 .22 breach O ring blow out problem

[mubhaur]

I understand that FX does not recognize the problem with Royael 400 .22 breach O ring set up. Ever since I bought this gun It blew the O ring after around 80 to 150 shots. Later I talked to Mr. Fredrick who very graciously sent me new brass Transfer ports. Once FX also sent me the new probe. All this helped a bit but not much. Recently some of my friends bought 4 new Royale 400 and all faced the same problem. I understand that the temperature here remains more than 40 C, may be it causes the O rings to further get soften due to which it happens. But it never happen with any of our Royale 500 .25. While closely inspecting of 500 and 400 I concluded that the tolerances and extrusion gap are much different in 500 and 400. Looking at this I locally developed a Brass Transfer port with all similar dimensions except that the breach entrance in which the probe enters is kept just a bit narrow. This provided a little deeper groove to the O ring. This set up is working fine after many hundred shots. Being a keen user of FX guns I wanted to share my experience with other users here who face such problem. I hope FX will take it positively and make the needful amendments in tolerances. Thanks and regards, 
Umair Bhaur
from
Pakistan

 

[FunGun]

Great piece of information, would you be willing to share more details about your developed brass transfer port? Picture would be greatly appreciated. Glad to hear you were able to solve this problem. congratulations!

 

[Menttaliist]

Have you tried using buna 70 or 90 instrad of polyurethane? I've heard about some people solving that issue with those ones. B.t.w i have one with no problems at all with a polyurethane oring in it

 

[jking]

I switched to 90 Buena's several months ago and haven't had any issues since, I think maybe it being stiffer prevents it from deforming and blowing out. Thousands of pellets through it and all is well.
Jimmy

 

[mubhaur]

90 shore definitely resolves the problem but that hardness is not ideal for extreme long range accuracy of soft JSB pellets. 

I did it in the past but then concluded that 70 shore is the best for breach seal.

With 90 shore, the cocking also becomes a bit hard due to the harder material. 

If share the pic here, there will be no use as the difference is readable only when checked through vernier caliper. 

I have recommended the same to Mr. Fredrick. 

 

[Guest]

The stock polyurethane breech seals blew out of my Marauders within just a few shots of being brand new. While I do not remember having an issue with the stock breech seals in either of my .22 FX rifles, I know the replacement O-rings noted above by others have worked very well.

 

[mcoulter]

Umair, thanks for sharing this information. I just ordered one (in .22) and will subscribe to this thread! 

 

[Dirte]

Must be a run of them........I have run thousands of pellets through mine and I'm still on my original. I have a bag of replacements if needed.