Wow. Finally had my Bobcat blow its breech o-ring.....And a thank you to TonyT..

[OldFalc]

First, I hope all here are well and in good spirits! My ears are ringing a little due to the aforementioned event! When the ring blew it bought to my attention not to use too much of non-domed shaped pellets in the breech! My 22 Bobcat was digesting quite a lot of Crosman Destroyers (great out to 20yards), and Piranha pellets (acceptable to 15 yards) due to good use on indoor rats on medium power. Maybe on the third mag of the night the ring blew.
Now I have ordered from McMaster-Carr picks and 2 bags (25 each) of o-rings in which a fellow forum member posted on his VERY useful and informative post! His name is Tony T.
Very useful stuff! It gave me confidence in taking this repair/replacement by myself rather than send the gun in for servicing.
I hope to be as good of a contributor/supporter to this forum as many as you are!
Thank you again AirgunNation and TonyT!!!
OldFalc 

 

[FXSHOOTER]

Can you please post a link to Tony's post on how to replace the O-Ring and where to buy them?

 

[OldFalc]

I have partially copied it here (of the entire post by Tony T.)
Sizes of FX Breech O-rings:

• (.177 cal) Metric 4.3mmx1.5mm Buna-N A70 O-ring http://www.mcmaster.com/mv1442521814/#9263k545/=z1ku8f
• (.22 cal) -009 Urethane A70 O-ring http://www.mcmaster.com/#9396k14/=z1kx41
  • (.25 cal) 6.35mm x 1.27mm Buna-N A70 O-ring http://www.oringsusa.com/catalog/product_info.php?cPath=1006_488&products_id=48811

I hope this helps. Do a search for Bobcat o ring and his post seems to be the best contribution to this subject.
I await my delivery and see if I can accomplish the cure. I hope all goes well with your situation!
Aloha!

 

[TKA87]

What is the O-ring size for the fill probe for the FX Bobcat MKll?

 

[OldFalc]

UPDATE for Breech o rings BOBCAT
Here is Tony T's full post:
September 22, 2015 at 7:20 am#36354In reply to: FX Royale O-Ring replacementTonyT 

“travels4fun”I posted this a while back for someone asking about changing out the breech o-ring on their Bobcat. Same applies for your Royale 200…GUIDE TO REPLACING AN FX BREACH O-RINGTools Required:

• O-ring Pick *
• Silicone Grease
• Pellet
• Dowel Rod or Cleaning Rod (should have a diameter slightly smaller than the bore diameter).

Sizes of FX Breech O-rings:

• (.177 cal) Metric 4.3mmx1.5mm Buna-N A70 O-ring http://www.mcmaster.com/mv1442521814/#9263k545/=z1ku8f
• (.22 cal) -009 Urethane A70 O-ring http://www.mcmaster.com/#9396k14/=z1kx41
• (.25 cal) 6.35mm x 1.27mm Buna-N A70 O-ring http://www.oringsusa.com/catalog/product_info.php?cPath=1006_488&products_id=488110

* O-ring picks and silicone grease are typically carried by scuba dive stores. The best pick I have found is available for less than $4 (see resources at end) A plastic cocktail skewer or safety pin can be used in lieu of a brass pick. However, you risk injuring yourself and possibly your rifle. Seriously, get yourself a set of $10 brass picks and be done with it.Step-by-Step O-Ring Replacement:

1. Insert a long rod down the barrel through the muzzle to the point where the end of the rod can be seen just inside the breach behind the breach O-ring. The rod keeps the new O-ring from getting pushed or slipping down the barrel which is a royal pain to get out
2. Using the pick, gently wedge the tip of the pick under a section of the O-ring between the channel holding the O-ring and the O-ring itself. This will lift a section of the O-ring up which will allow you to pry the rest of the O-ring free from its channel. Remove the old O-ring and discard.
3. Take a new O-ring and smear silicone grease all over it. Work the greased O-ring between your fingers so the silicone can spread all over it.
4. This is the tricky bit. Take the new O-ring and pinch it between thumb and forefinger and gently place insert into the breach. It may need to be nudged into place. Once in place, it should be sitting just behind the pellet skirt just inside the breach.
5. Using the tip of the O-ring pick, start prodding a portion of the O-ring into the groove of the channel that holds the O-ring in place. The approach is to seat a small section bit by bit working your way around. The method is quite similar to replacing and inner tube on a bicycle wheel.
6. Once the O-ring is completely seated in its channel, gently push the pellet probe forward to make sure it clears the newly installed O-ring. Do this a couple of times. If you wish, you can use the tip of a cotton swab to clean any spare silicone grease present inside the breach or on the pellet probe.
   [/LIST=1]
   RESOURCES:
   6″ miniature push/pull hook pic ($3.93 from McMaster-Carr): http://www.mcmaster.com/#7426a32/=wxb27w
   Scott

1. 
   Scott,
   Item 4, second sentence mentions a pellet skirt. Where did thepellet skirt enter the picture?
   Tony able to help. Since I have more than a couple of probes my problem would be easily solved. Try a search on this forum.
   Sorry I could not devote more time this inquiry.
   
   I do not know about the probe o-rings but Airguns of Arizona should b