It's true IF you consider the spring expansion pushing the piston does, in fact, recoil against the guns total mass. Half the spring energy does go there. ( which may be forward )
I fear we might quibble over semantics ?
( which does not mean we should not strive to obtain correct definitions of the words, and how we apply them. To that end, I will always welcome correction )
(( for the benefit of the not subscribed casual reader, if nothing else ))
Now, if a way can be found to recover such things as spring recoil, and redirect it so that it ultimately aids pushing the pellet......
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