Mainly just curious

Things would have to be machined much more precise and would need some kind of permanent lubrication. Probably is possible but would be very costly!
There are a few designs that use orings like piston rings in a car but you still need some kind of buffer for end of the stroke so its not steel on steel slamming together!
 
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Hy Score pistols used both steal and synthetic rings. Depending or the year of production. Part #849
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