The major difference between the two designs was that the BSA weapons were chambered for .303 British ammunition, but the Savage guns were chambered for .30-06 cartridges, which necessitated some difference in the magazine, feed mechanism, bolt, barrel, extractors, and gas operation system.
Den store forskel mellem de to modeller var at BSA våbnene var forberedt til .303 British ammunition, mens Savage våbnene benyttede .30-06 patroner, hvilket afstedkom nogle ændringer i magasin og lademekanisme, bundstykke, løb, udkast og gas operationssystem.