Tuning O-Ring kits???

[Fly]

Where can o-ring kits be bought for AEA 357 Challenger ? Also for Hatsan 22 flash? 

Fly

 

[Saltlake58]

If you can find the specifications, it's usually cheaper to buy the o-rings in quantity from someplace like the O-Ring Store. For $20 or $30 bucks you can buy enough o-rings to rebuild the gun multiple times rather than $20 bucks for one kit.

The O-Ring Store is The O-Ring Store LLC, We make getting O-Rings easy! (theoringstore.com)

There are a couple other places like McMaster-Carr and others. Usually much better value