You know, at first I also thought Advanced armor wouldn't fit. But then I realized that if I put the main gun in an oversized turret, I could "buy" another slot! I know a turret is un-scorpion-like, but this upgrade is much better.
Scorpion Battle Armor (PPC)
Type: Scorpion Battle Armor
Manufacturer: Somebody
Primary Factory: Somewhere
Tech Base: Inner Sphere (Standard)
Chassis Type: Quad
Weight Class: Medium
Maximum Weight: 1,000 kg
Battle Value: 225
Swarm/Leg Attack/Mechanized/AP: No/No/No/No
Equipment Slots Mass
Chassis: 175 kg
Motive System:
Ground MP: 5 120 kg
Jump MP: 0 0 kg
Manipulators:
Left Arm: None 0 kg
Right Arm: None 0 kg
Armor: Advanced 5 320 kg
Armor Value: 8 + 1 (Trooper)
Slots
Weapons and Equipment Location (Capacity) Mass
SRM 2 (OS) Body 2 75 kg
Standard Turret Turret 3 (3) 60 kg
Support PPC - 2 250kg
Scorpion Battle Armor (12S)
Type: Scorpion Battle Armor
Manufacturer: Somebody
Primary Factory: Somewhere
Tech Base: Inner Sphere (Standard)
Chassis Type: Quad
Weight Class: Medium
Maximum Weight: 1,000 kg
Battle Value: 262
Swarm/Leg Attack/Mechanized/AP: No/No/No/No
Equipment Slots Mass
Chassis: 175 kg
Motive System:
Ground MP: 5 120 kg
Jump MP: 0 0 kg
Manipulators:
Left Arm: None 0 kg
Right Arm: None 0 kg
Armor: Advanced 5 320 kg
Armor Value: 8 + 1 (Trooper)
Slots
Weapons and Equipment Location (Capacity) Mass
SRM 2 (OS) Body 2 75 kg
Standard Turret Turret 3 (3) 60 kg
Recoilless Rifle (Med.) - 2 250kg