Thit is a S&W M&P Full-Auto (M16) BCG. Test fired by S&W to ensure reliability.

It features:

1. MPI tested Bolt MP4 (Individually tested)
2. HP tested Bolt (Individually tested)
3. Black extractor spring Insert
4. Crane O-ring
5. Shot peened Bolt
6. Chrome Lined Carrier
7. Chrome Lined Gas Key
8. Grade 8 Hardened bolts