Author Topic: JKhahn .25 cal o-rings  (Read 577 times)

cpt_sfc

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JKhahn .25 cal o-rings
« on: May 17, 2020, 07:17:15 PM »
Does anyone happen to know what size o rings go in the breech of the jkhahn nobelese bullpup and the Majisty they are different, Both 25 cal. I have hundreds of o rings and not one will fit either rifle. Thanks for any help. So far O rings are only thing to go wrong.



steveoh

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Re: JKhahn .25 cal o-rings
« Reply #1 on: May 17, 2020, 08:58:49 PM »
Does anyone happen to know what size o rings go in the breech of the jkhahn nobelese bullpup and the Majisty they are different, Both 25 cal. I have hundreds of o rings and not one will fit either rifle. Thanks for any help. So far O rings are only thing to go wrong.

Don’t know... sorry.

I’m in the same boat with a Sam Yang 909s I took apart today. I have 4 assorted sets of O-rings, and a bunch more I’d ordered from the O-ring store. Some were close but I’d rather have exact replacements.  Is it too much to ask that manufacturers post a list of required O-rings?

Sheesh. The 909 is holding air but the fill valve is acting up. Going to take a chunk of some plastic to I have and turn down a new check valve on my drill press. Yes I am that high tech.
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cpt_sfc

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Re: JKhahn .25 cal o-rings
« Reply #2 on: May 26, 2020, 07:06:51 AM »
Update . ordered o rings as mentioned. Still not a correct fit. So I took the 111 size and shaved one side of o ring till it fit into groove snug and let the probe by. Now works great.  Put the now flat side toward bore and round side toward probe, works better then cat snot.
Thanks for the assist.

steveoh

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Re: JKhahn .25 cal o-rings
« Reply #3 on: May 26, 2020, 08:55:10 AM »
Update . ordered o rings as mentioned. Still not a correct fit. So I took the 111 size and shaved one side of o ring till it fit into groove snug and let the probe by. Now works great.  Put the now flat side toward bore and round side toward probe, works better then cat snot.
Thanks for the assist.

Brilliant!
  • Benicia, California
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Alan

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Re: JKhahn .25 cal o-rings
« Reply #4 on: May 26, 2020, 10:44:48 AM »
I'm with Steve on this, as I think EVERY manufacturer should mention the various sized requires in the owner's manual. As in... "What the hey does a few dozen words cost?"
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Alan

I have an Omega compressor. If you're a fellow Guild member, and you pass through Roswell, NM, I'll fill your portable tank as a courtesy.

steveoh

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Re: JKhahn .25 cal o-rings
« Reply #5 on: May 26, 2020, 11:07:49 AM »
A month or so ago I tried tracking down a comprehensive list of o-rings for my Sumatra Carbine. Someone shared a list with me that had some very incorrect sizes that would not let me reassemble the Sumatra.

So I contacted Pyramyd Air, and Will Piatt. Will confirmed some correct sizes and provided sizes for several way off o-rings. Pyramyd got back to me and also gave me a list. I’ve provided this corrected list on the forum.

The 909s o-ring list is proving to be every bit as elusive, and I do not have a comprehensive and tested list yet. Pyramyd answered my latest request with, we can sell you a set of O-rings for $23.28 or

Quote
Steve; We have o-ring kits for the Sam Yang big bores. Is your rifle a single air tube or double air tube (500 cc)?                                                             We can re-build the gun for you, It is a complicated rebuild, It would take 3-6 weeks . An estimate is $125-$165.                                                  You can get a faster turn around on a rebuild with Saddle mountain Gunsmith. 336-657-3306. Mr Will Piatt. He does very good work. Thank You,Mark               


He later attached a link to a labeled parts diagram. Unfortunately that link was to his C: drive. Doh. I’m waiting to hear back.

In the meantime I’m annoyed that it is so difficult to get a simple parts list with correct o-ring sizes. Gonna stop buying new airguns unless I can get parts lists before I buy.
  • Benicia, California
Quackenbush .58 Outlaw
Shooting Chairs
Vallejo Ferry Schedule
DAQ .458 LA Outlaw Rifle
Sam Yang 909s .45
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RWS Diana 350Magnum Compact Pro .22
QB-79 .177
Crosman 1322
Crosman 1377 - HoRodded 10 FPE
Diana Model 27 (childhood airgun)
Tolman Skiff
Airgun Calculator