The only metal replica is the I know of is the Denix which I bought a few months ago second hand , I have one which I have transfered steel parts from a faulty doner MGC Mac 11 which I bought very cheap as it wasn’t working . I have replaced the stock assembly , sling loop , bolt , cocking handle , all the pins and trigger mech , return spring , mag release catch and fitted an original magazine and deactivated sionics suppressor .
All the weak zinc parts are now steel and the nasty bolt has the high quality MGC one . The cocking knob also locks as a safety measure when the bolt is closed which the Denix didn’t .
I have re blackened the whole gun and impressed with the function and finish .
Obviously it doesn’t fire anything it’s just a realistic replica which isn’t plastic and looks the part especially with the real sionocs fitted .
Regards Steiner