Awhile back S&W built some M16 (FA) BCG's for a contract. S&W only uses SA BCG's in their AR's so this is kind a rare item for them. Since they cannot use them, they have offered them to us!
These BCG's came from the same place that companies like Colt buy some of their BCG's from.
Each Bolt is HPT and MPI'd! The bolt is also marked MP4. A black extractor insert, copper colored 4 coil extractor spring and a Crane O-Ring is also installed.
Cost is $235.
If interested, you can order one here:
S&W M&P Full Auto Bolt Carrier Group at G and R Tactical
C4
MP4 Engraving