Kflash,
The anchor loops came on the Marine version of the M416's I think they are technically called M416b's
Adventure Copan,
They are Pelican 1630 cases. I scored these at an auction a couple of years ago for a steal. I had to build a 2x4 platform to get the cases up high enough so I could open them. My trailer is a double duty trailer home depot and the dump 1 weekend and camping the rest.
Kflash,
The anchor loops came on the Marine version of the M416's I think they are technically called M416b's