So far this still looks like the most complete parts list:

s&w404760000 firing pin :13.00
s&w404770000 firing pin spring :2.00
s&w404780000 pin, coil spring :1.00
s&w315430000 .22 extractor rev :5.00
s&w315610000 extractor spring :1.00
s&w406130000 extractor plunger :5.00
s&w407790000 BLUE bolt spring :?
s&w408300000 15-22 25rd fde :?
s&w404510000 upper : $19.99

S&w405020000 b106 22 AR bbl threaded 16.5" rev A
S&w404570000 ejector

I may have a new number to add for the barrel extension:
404560000



I haven't tried ordering it though. Notice the the holes for the roll pins aren't drilled.

Would be nice if this could be ordered. Even nicer if the ejector could be ordered.