Sentence:  This is the Model 122 ( about $ 20 ) ; it <WSD>'s</WSD> a single-shot bolt-action with an automatic safety - i. e. , the safety goes on every time the bolt is lifted and the gun cocked for the next shot . 
Meaning of the word marked with <WSD> tags:  have the quality of being; (copula, used with an adjective or a predicate noun)