Breech o-ring for fx indy

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greg

Member
Apr 2, 2015
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Washington
What size o-ring do I need for the .22 FX Indy breech? I feel a puff of air on my face with each shot (when mag is out). Interestingly, it's been the case from day 1. Crony still shows fairly consistent strings, but I figure what the heck, changing the o-ring after a year of light use cant hurt.

Also, any suggestions on better materials/brands for the o-rings? Thanks!

[edit: typo]
 

Thanks! I googled for 5.28 mm x 1.78 mm A70 Polyurethane o-ring and the first few results came from AGN site where you answered the same question already more than once :) 

Speaking of those very useful old threads, you write: 

-- travels4fun:
I don’t use polyurethane unless it specified by the manufacturer. Otherwise, stick to Buna-N. FX Revolution:
-009 Polyurethane A90 (Factory Spec); However, I would buy the -009 Buna-N A90 and try them out. http://www.mcmaster.com/#5308t118/=y5pw89

Same advise for the Indy? Any reason to use urethane, is it more durable/etc?
 
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OK, so its about wear resistance. from the site:

Oil-Resistant Buna-N—Harder than our multipurpose Buna-N O-rings, these have better wear resistance. In addition to oil, these O-rings also resist grease and hydraulic fluids. They meet ASTM D2000. The inch O-rings also meet SAE J200. Temperature range is -20° to 250° F. Durometer is A90 (hard). Color is black.

High-Strength Polyurethane—More abrasion resistant than Buna-N and other rubber, polyurethane O-rings offer the best resistance to wear and tearing. They also resist salt water and gasoline. O-rings meet ASTM D2000/SAE J200. Temperature range is -40° to 200° F. Durometer is A70 (medium). Color is black.

Ultra-High-Strength Polyurethane—With a durometer of A90 (hard), these O-rings are harder and are better for high-pressure applications than high-strength polyurethane. They resist tearing. Temperature range is -65° to 275° F. Color is cream.

The "Ultra High Strength" in the same size is $10 for a pack of 5 (!) http://www.mcmaster.com/#9558k515/=107lbeh
It has no acids listed as safe though.
 
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"greg"
Thanks! I googled for 5.28 mm x 1.78 mm A70 Polyurethane o-ring and the first few results came from AGN site where you answered the same question already more than once :) 

Speaking of those very useful old threads, you write: 

-- travels4fun:
I don’t use polyurethane unless it specified by the manufacturer. Otherwise, stick to Buna-N. FX Revolution:
-009 Polyurethane A90 (Factory Spec); However, I would buy the -009 Buna-N A90 and try them out. http://www.mcmaster.com/#5308t118/=y5pw89

Same advise for the Indy? Any reason to use urethane, is it more durable/etc?


Click to expand...
FX shows the .22 cal breach o-ring as being Polyurethane A70. You can see the specs in the Royale drawings under the Support Section of the FX website.

 
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