Originally Posted by
Fisselig
No, that just makes it a spring-loaded or spring-assisted action similar to a folding knife.
A semi-auto action uses gases (using a piston in DI, long or short-stroke) / back pressure (blowback designs) to cycle the bolt backwards when the trigger is pulled, with the recoil spring acting as both a mechanism to slow down the bolt carrier travelling back, and to return the carrier back forward.
If you pull the trigger on this design, nothing will happen with the bolt since you have to pull the bolt back manually to chamber another round.