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Recently I heard that you shouldn't use silicone oil in pellet guns with metal pistons, I have been using it in my guns piston for a while now, what do I do?
Clean it all out asap, it turns to a gritty/sandy grinding paste anywhere there is metal to metal or even metal to plastic friction.

I just use it very sparingly and very rarely on rubber seals to stop them drieing up and cracking etc.
 

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I used a bit to much on my 1377 bolt probe seal, it got between the brass bolt and plastic reciever and turned to a gritty paste... horrible stuff but good for seals and preserving metal work against cocorrosion.
 

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Ben organised a demonstration this afternoon at his workshop which involved revolving a steel bar in his lathe and then winding another piece of steel against its side. With no lubrication at all the two pieces of steel slide together but once a few drops of silicone oil was applied the steel immediately started to be worn away in a very disturbing manner. Clear evidence if any were needed at the instant destructive ability of this oil on sliding metal surfaces.
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