Sci-fi book, possibly yellow jacket (Gollanz?). The character “Candy Man” has a gun that shoots lots of small bullets at once (flechette?) and each bullet trails a ribbon so it shreds the victim.
And that’s all I can remember except it was in a public library, in the early 70s.
I’d bet on “Candy Man” by Vincent King, 1971. There was a Gollancz edition with a bright yellow cover.