The FAL being modelled by our own Miss Magnum below is a Centruy gun.
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It has an Imbel receiver and came with the thumbhole stock. The receiver itself is cut for metric mags, but is also cut for the folcing cocking handle and the top cover legs of the inch gun. All the parts are inch, including the barrel, which uses the breeching washer. The muzzle threads were cut-off and recrowned by Century.
I installed a US inch gas piston and First Sons Enterprises hammer, trigger, and sear. I also use the US follower and floorplate for metric mags, since that's what the receiver is cut to take. That allowed me to use the original Brit furniture. The gun itself runs great.
The inch guns are semi's, but only because the various users installed a semi-only selector. On a genuine inch gun, if you swap the selector with one from an L2/C2 you have a select-fire weapon. So that pretty much validates the BATF view that it's a machinegun.
I have found Imbels to be fantastic receivers to build on, and would not hesitate to even try another Century if I could physically examine it before purchase.
Ross