UNIT PT

PT 12 - Advance Headpiece (Goliath, Catapult)

PT 15 - Booster, Earthquake Punch (Goliath) Backpack, Flame Blaster (Catapult)

PT 30 - Cutter (Goliath) Rocket Launcher (Catapult)

PT 40 - Net Gun (Sub-weapon, Goliath) Multi Missile (Sub-Weapon, Catapult)

-Once you reach Unit PT40, you can upgrade your MAU with a sub-weapon.

-the Goliath gets a Net Gun which can capture an enemy for 10 seconds, this prevents them from moving and attacking back.

-the Catapult gets a Multi-Missile Launcher, currently available missile?s decrease defense and evasion rate?s of your foe?s. Each sub-weapon ammo clip can only be used 10 times before you need another clip (you can carry multiple clips). These clips cost around 33,000 varying dependant on your race?s current tax rate.
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Advanced Upgrades

Base Level 35, PT 52 - Advanced Scissors (Goliath) Galvanic Gatling Gun (Catapult)

Base Level 37, PT 62 - Last Weapon Upgrades and Leg Armor Upgrade 10 elemental defense

Base Level 38, PT 75 - Last Chest Armor Upgrade with more DEF

[Base Level being your character level.]
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Upgrades for Armor Riders Level 40-50

Goliath
LV41 80pt Energy Booster (ST500 8 ammo)
LV42 88pt Correct Eye Head (Def 891, increase 40 from LV40?s Head)
LV43 81pt Electro Knife Arm (Attack 9205-10228)
LV45 78pt Type C Missile (longer range than previous one, and the looks)
F. Reflet Leg (Def 2552 resist 15, increase 671 from LV40?s Leg)
LV48 93pt new arm, head, and armor. Names not comfirmed, only arm?s attack power is known 16237-18040

LV41 80pt Mega Megazine Tab (ST10 4 ammo)
LV42 88pt Correct Catapult Head (Def 821)
LV43 81pt Advance Gattling Arm (Attack 9205-10228)
LV45 78pt Type C Missile (Longer Range)
Harden Steel Leg (Def 1861 Resist 15)
LV48 same as Goliath

[Source] RFOnline Philipean Forums