The parts next to the revolver is actually from a 1911a1 also known as the Colt .45 automatic. Hey, manga artist, here is a reference book. The S&W Revolvers: a Shop Manual, New Expanded 5th Edition by Jerry Kuhnhausen. He got a series of books.
At the night when Lute and Snow talked about finding there parents, Lute could have fixed the issue of a missunderstanding he could have sayd: "This night mind sleeping next to me?",Rather he says? "Mind sleeping with me?"(and i am aware that the author of the story intended the weird and missleading bits)