Tuning Gamo urban bolt probe o-ring

[Cbourbeau32]

Hello, I am wondering if anyone knows of the exact size of the bolt probe o-ring for the Urban. I need to order some. 

Thanks 

 

[CharlieF]

https://www.pyramydair.com/product/air-venturi-probe-o-ring-replacement-thin-4pk-fits-gamo-and-bsa?a=1179

 

[Ryanduquette]

Does anyone know how to change the bolt prob o ring in a gamo urban??

 

[Scotty1]

Does anyone know how to change the bolt prob o ring in a gamo urban??

I’ve done it with 2 loops of dental floss through the o-ring, it allows you to work through the breech with both hands. It helps to have someone hold the bolt in a good spot. 

 

[Ryanduquette]

Thank you very much 

 

[jarmstrong]

Scotty, thanks for the floss trick.

I found the inside edge of the pellet hole of the mag.

to have a sharp edge, o-ring cutting bugger

I also replaced the spring and ball that applies a side force on the bolt and holds the bolt down, when in the forward position. I made a spring about 1/2 the lenght of the original spring and found some 6 mm delrin balls on fleabay,, makes for a much smoother cocking, but that repair/improvement requires you to disassemble the gun