Here is an interesting attachment

[RCS]

I doubt there are many of these still around except in the Soviet Union ?Attachment 95211

Information

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[Warren]

They are repro's that hit the market about 15 years ago.
From memory the makers code is cxx (Cannot remember the last two code letters but can check as I have one someplace)
A cotter pin moves the trigger roller from the 42 to 34 position.

[Tom in N.J.]

A winter trigger for the MG34 & MG42... . Post war parts made for the MG3 and Yugo versions are not 'reproductions'.