MRC:
An indication of the weapon/s/ for which the item is designed.AHVQ
Weapon For Which Designed:
Gun m1, gun m2, gun m3, gun t8, gun m36, gun m41, gun m54
MRC:
A feature of the item of supply which must be specifically recorded when the reference number covers a range of items.ZZZY
Reference Number Differentiating Characteristics:
As differentiated by cartridge case material, fuze type, fuze model number, fuze delay time, projectile filler type, propellant characteristic markings, propelling charge feature type, weapon for which designed, unit package quantity, unit package type, package model number