I think SA made the barrels for the Navy. The Navy let contracts to American Machine & Foundry as well as H&R to assemble MK2 MOD1, 7.62MM Garands. AMC and H&R added a larger "7.62" as well as their own markings, "AMC," or "H&R" to show that they did the work.

Both AMC and H&R also built MK2 MOD0 rifles for the Navy. These were Garands that had a spacer placed in the chamber to accomodate 7.62MM ammo.

The Navy used the SA barrels for NM rifles. They were selected by air gauging them as I recall.

For additional info see articles in The Garandicon Stand Report and The GCAicon Journal.
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