That's a buffer ram, spent some time toying with that idea, and whilst I agree with you it that you avoid all valvetry and flow problems, to design and machine that ram into a size which will fit inside a featherweight will be difficult. For a heavyweight it would probably be a good option but it's been mentioned that the velocity of the piston will be so high that there is a high possibility of blowing the cylinder top cap off...and that sort of put me off.
But I like the concept.
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