All Springer/NP/PCP Air Gun Discussion General > PCP/CO2/HPA Air Gun Gates "The Darkside"
Qb and crosman o-ring sizes and where to buy?
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SwampHunter:
Does anyone have the sizes of the orings needed to rebuild a qb 79 and/or crosman/Benji maximus,disco,fortitude series? Trying to put together a kit so I'm not constantly ordering small kits for more money lol. McMaster Carr the best place to get them from or possibly captain o ring?
SwampHunter:
Sorry, I forgot I have to use Google search to find things here, found most of the o ring sizes already
Goose:
The QB78 uses #113 o-rings for the valve and endcap.
1. valve -#113
2. end cap -#113
3. barrel -#012 [qty 3]
4. .177 bolt M1 x 2.5 or -#003
5. .22 bolt -#006
Buna-N in 70 durometer is fine for all of them except the end cap which needs to be polyurethane. You can use Buna-N but it will swell and you'll have to swap it when changing cartridges (it will return to its original size after a while and you can re-use it). The Buna does swell a bunch. See pic.
I can't address the others as I've never been into one of them.
Luck,
J~
SwampHunter:
Thank you Jeff!
TennX:
Dont anything about 79….but I got kits for my 78’s off ebay..enough for 2 rebuilds .22/.177…good luck
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