this all boils down to....... no more than 10 foreign parts.
There is no way to make a working SA42 with 10 foreign parts. It can't be done with any of the build methods I've ever seen on this board.
worst case scenario ,
Using a foreign FAL FCG. you still have to re-manufacture the hammer with a dremel into a new shape that won't work in a FAL, ......... it's now a US part, the trigger ......... add a MG42 trigger shoe, now it doesn't fit into a FAL anymore and ........... Its a US part. Semi-auto converted MG42 gripstick ............US part , doesn't fit on a MG42 anymore. SA bolt carrier ............ won't work in a , yadda yadda yadda you get the idea.
theres so much work done to these parts to make a legal closed bolt semi-auto that there are too few unaltered parts left to count against you in the foreign parts count game. That doesn't mean we should give the BATFE a pass on an obviously wrong ruling but it just don't affect our builds. viewtopic.php?f=27&t=1472