The Sypranic 8 round Revolver V2 has been published (for a while actually) and is recommended.
the upgrade includes a functioning true trigger mechanism.
it can be found here; http://www.instructables.com/id/Sypranic-8-round-Revolver-v20/
modeled (or trying) from the Colt Single action army revolver and modern from the Colt Python. This gun lacks an auto revolve or a true trigger, I don't trust triggers on this that well for it your off in the cylander you may damage it. Also sorry revolver fans but it dose not have a hammer...
OK enough storys time for the stats/flaws/strengths
1)sometimes a bullet gets in the way of the cylinder preventing you to turn it until you push it back in. - easily fixed
2)dose not have a normal block trigger. - Chamber trigger?
3) 2 handed not including bolting it back (you will see what I mean for flaw 2 and 3 on the 4th page)
2)smaller then a mag gun with the same amount of shots. - with maybe exceptions of new ones with mags in handles (idk yet)
3)cheap/mercy on new builders or people with not many pieces. yet is still good for experienced builders!
4) first of kind to use this kind of cylinder idea.
5) no way to jam if built right and nothing is in/mis shappen the barrel.