I've seen pictures of real Navy Seal 416's and they have the aac-m4 2000...
The AAC-M4 2000 also has an NSN on the housing as well.
Testes have shown that the AAC M4-2000 is quieter. Although I think the Surefire 212 has a less POI shift.
Major Malfunction, one of the biggest silencer distributers in the country agrees the AAC M4-2000 is a better can.
Google up Silencertalk forums AAC M4-2000 vs Surefire 212 thread. Or watch AAC's channel of Mike Mers and Rachael showing how the welds inside hold up after a silencer torture test of the M4-2000,
Both great cans nontheless. Along with KAC NT4. I find the KAC NT4 can to have some play on the mount and is pretty heavy compared to the SF and AAC cans.
The silencers used in ZERODARKTHIRTY is indeed the AAC M4-2000
from Militarytimes.com