Luis,
Of course, such experiments may be interesting, but only as experiments, nothing more.
Once again, i would never mount such a lens on my M.
What for?
In this domain, there is a widely distributed myth, wich consists in a simple and completely FALSE equation: russian military optical device quality=russian photo lenses quality. Very tempting, indeed, but not true; and it has never been so, even - and particulary - during the soviet period. One should not over-value those lenses: while certainly very good for their modest price, they never stand any comparison to the best german or japanese items - here they simply meet more than their match, either in terms of optical or mecanical construction.
Regards,
Leo