..but I wasnt suggesting using it in a crosman. I was thinking some kind of specially made combustion chamber behind the breech into which the pressurised oxygen (Or maybe NOx) could be injected trough a non return valve. As an engineer caseless fuel/ammo and an oxidising gas seems like an interesting concept for a rifle to me...but I guess there must be a reason why noone makes them already.
The petroleum jelly in a spring/HPA rifle does work well though, you should try it.
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