Pre-AoD 'Mech Weight Classifications 
Here is a list of which pre-AoD 'Mechs belong to which weight class. Normally, a player would not be able to assign a pilot or gear to a pre-AoD (Mechwarrior: Dark Ages) 'Mech. However, there are still a large number of Dark Ages units in players hands, and enough demand to play them in regular games. Pre-AoD, or Dark Age, units are from the following booster releases: Dark Ages, Fire for Effect, Death from Above, Liao Incursion, CounterAssault and Falcon's Prey.
Industrial 'Mechs - (considered to be light 'Mechs, including the MOD units)
AgroMech, ConstructionMech, ForestryMech, MiningMech and SalvageMech.
Light 'Mechs
Arbalest, Blade, Cougar, CrimsonHawk, Eyrie, Firestarter, Koshi, Locust, Mjolnir, Ocelot, Pack Hunter, Panther, Paider, Raider MkII, Spider, Stinger, Storm Raider, Tiburon, Uller, Valiant, Wasp, Wolfhound.
Medium 'Mechs
Black Hawk, Centurion, Dasher II, Ghost, Griffin, Gyrfalcon, Hatchetman, Legionnaire, Mad Cat III, Mongoose, Phoenix Hawk, Shadow Hawk, Shockwave, Sun Cobra, Targe, Uziel.
Heavy 'Mechs
Black Knight, Catapult, Mad Cat II, Rifleman, Ryoken II, Shadow Cat II, Shen-Yi, Sphinx, Thor, Thunderbolt, Ti Ts'ang, Tian-zong, Tundra Wolf, Vulture.
Assault 'Mechs
Atlas, Cyclops, Cygnus, Hellstar, Jupiter, Kodiak, Lonhbow, Marauder II, Shrike, Templar, Warhammer, Yu Huang, Zeus.
Playing Hints: Most of the Unique units have good enough stats not to need pilot cards. However, the regular units might benefit from assigning a common pilot, and a single gear card. The "trick" then, is to get the players to keep accurate tabs on which pilot and gear belong to which unit.