English to Dutch Tech/Engineering Military / Defense Pistol terminology

Uit dezelfde handleiding als vorige vraag:

The xxx uses an exclusive xxx designed innovative locked-breech with rotating barrel system, the strongest action to date.

En nog een zin:

Never pull or push a loaded firearm toward yourself or another person. Always unload a firearm, visually
and physically check to see that the magazine, loading mechanism and chamber are unloaded, and action is open before handing it to another person.

Wat wordt er precies met action bedoeld in deze context en wat is de Nederlandse vertaling?