If:It is close rangeYou use enough pumpsThe crow is standing perfectly stillYou are an excellent shotAnd you put it right through the crow's eye,Then yes, you can kill a crow with a Crosman Pumpmaster 760.
Go to the link below, and click on "customer care." I believe Crosman still repairs these rifles.
The model 760B has a scope rail built in. I am not sure about the older 760's, there were 9 older versions made. I would not go crazy and purchase an expensive scope for it considering the rifle only cost around $30, but yes it is scopeable. Crosman make a scope that fits the 760 and is not expensive. see the link below
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If you are asking about a pumpmaster made by Crosman then see the related link. There you will find at the bottom of the page a section called "download a manual" that will take you to all the Crosman owners manuals.
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See the link below for all of Crosmans Owners and parts manuals.
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easy