It seems the bolt carrier group is the hard to get part for AR-15's
currently. I have found old Colt M16 A1 parts kits, "good to excellent"
minus lower receiver and barrel (plus missing auto-sear or disconnector).
Would the M16 bolt carrier group be good in an AR-15?

I found some bolt carrier groups in stock for $300 but the M16 parts kits
are available in the $500 - $600 range, seems to be a better value maybe. I
read a review of one of these parts kits being assembled, they said it was a
good shooter.

RogerN