Had US Army Ordnance actually succeeded in cloning the MG 42 (they failed due to dimensional errors), they would be far ahead of where they ended up with the M60. The M60 uses a similar belt feed mechanism to the MG 42, but it eliminates two-stage feeding, which is the best thing about that mechanism. That is to say, the MG 42 advances the belt halfway each on the rearward and return stroke of the bolt, instead of doing it all on one stroke. The advantage of this is a much smoother feed of the belt.
The M60 operates more like an FG 42 with belt instead of magazine feeding.
I made no claim that the US did a good job with their cloning. Some would argue that the Springfield is not made as well as the Mauser. My point was that that the US has adopted more foreign designs than you alluded to. You said there were two. Off the top of my head I rattled off another 8. If you include other types of weapons (Artillery for example) there's probably more.
I leave any comments as to quality of any weapons to others.


















































