If you don't mind shopping at Renderotica, a google search says they have some chained prop/pose sets. Most are probably for V4 as the chainee but probably would work for M4 as well. Due to the subject matter, viewer discretion is advised, NSFW etc.

BionicRooster's chains are also at sharecg looks like maybe some others as well.

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken