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Is the Bushmaster 14.5" M-4 barrel (pre-ban) with the standard A2 birdcage flash hider installed considered a standard or heavy barrel?

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Overview

It would be an M4 profile barrel which is standard weight under the handguards but heavy weight from the front sight to muzzle with a notch for mounting an M203 grenade launcher. It uses the heavy barrel .750" diameter sight base.
Heavy barrels are heavy at the chamber end and taper to the muzzle using the .750" diameter sight base.
A standard barrel tapers sharply at the chamber to a lightweight diameter to the muzzle using a .625" diameter sight base.
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