With a high round count...you'll eventually have to replace the spring on a piston rifle, due to a reduction in velocity. I heard that CO2 rifles suffer a reduction in velocity due to cold temperatures. My RWS Diana Model 54 springer is based on a recoilless system.
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That rifle hanging on the wall of the working class flat or labourer's cottage is the symbol of democracy. It is our job to see that it stays there."
--- George Orwell
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