Best source of 'O'-rings and seals for a Mk II?

[MikeJ]

Something odd going on........ at 50m on a calm day at the range my groups from a full magazine went from 0.75" to 1.75"    Bottle pressure hadn't moved and chrono was unavailable, so I was beginning to think that there was a blockage somewhere. Got home and noticed bubbles emerging from around the exhaust valve blanking plug which sits above the regulator/quick fill adapter. I guess a strip down will be in order (it must be ten years since I last did so) and I'm wondering if there's any advice on here concerning the best source of 'O'-rings that are the correct dimensions and hardness? I'm not convinced that eBay is the best source!

[Ca_Varminter]

The size of the O-ring is BS015..
When remove the Blanking Plug. Check the condition of the O-ring.
If is flatten, brittle or cracked..you need to replace it.
but if it is in good condition, it might be a little dry...
So clean the O-ring and sealing surface on your Rapid Receiver of any dried lube or debris.
When you reassemble, don't forget to lube it..

As for a source... Check with KevG or Dr Bob..

Good Luck,
Stuart

[MikeJ]

Thanks Stuart. Just a standard 'O'-ring then. I can find those easily; presumably no special consideration for material hardness!

[Ca_Varminter]

I prefer Viton O-Rings..they are oil and solvent resistant...
I also like them in the 75a to 90a in hardness....

Stuart

[MikeJ]

I prefer Viton O-Rings..they are oil and solvent resistant...
I also like them in the 75a to 90a in hardness....

Stuart

Just found several new ones in my spares box; must be from a previous rebuild. Leak all sorted...... now back to the range to work out why the grouping has gone awry!