benjamine maurader

Yes. Order the parts from crossman.

You'll need a new barrel and bolt, not sure if you need a new breech also. Here's a link to their parts diagram page, if you have a model # it's easier.
https://support.crosman.com/hc/en-us/sections/200658090-Benjamin-and-Sheridan-Air-Rifles?page=2#articles

.177 to a .22 yes with a barrel and bolt. .177 or .22 to .25 not worth it better off getting a used .25 as you need a breech and TP and Valve and barrel and bolt.

Some things may be more trouble than it's worth. I second what Dairyboy said and maybe just sell your .177 and buy a used .25. Too bad I don't have a .25 to sell you if that's what you really want. PM me if you want a .22 though