These are new stock Ontario Knife Company OKC3 M9 Bayonet Knives.
Both bayonet and scabbard are manufactured by Ontario Knife company.
Bayonets are marked: "M9 ONTARIO Knife Co. USA" while the scabbards are marked "Ontario Knife Company".
The M9 Bayonet features the built in wire cutter (The nub on the scabbard and hole towards the blade tip). The M9 has seen extensive use with the US Army since the early 1990s.
These will fit M16/AR-15 rifles with bayonet lugs.