I have an archangel charger stock that I will attempt to put an m4 butt stock on this weekend. I bought the stock cheap and figured i could make it work. It will require some head scratching and fabrication though. There is a cover on the end of the archangel stock (held on by the sling swivel)that can be removed, but the hole it covers is only 1" diameter. The thread of an m4 buffer tube is 1-3/16" I believe, and there isn't much material to drill the hole larger without cracking the plastic. so I will have to get creative. I will post some pictures of what I come up with
If you want the archangel with a butt stock, it would be easier to start with the standard rifle stock. Mystic precision (link top of page) lists them for $235