Dr Zero, would you mind if I posted a FR8 and FR7 serial number survey? I am trying to determine how many FR8's were converted? I have gleaned serial number ranges from 184xx to 476xx (looking at others posted carbines on many sights).
FYI, these site links are no longer available (i.e., site/object not found).
.....solder per BATF
if you know how to do all this stuff, then it may be possible for you to build one, but if that’s the case, you probably wont need to know how cause you will be able to look at the parts kit and completely understand. Here is a decent article explaining how one person built his rifle but no pictures