Not sure you can really consider this an upgrade, but it swaps the large laser for a full Blazer, dropping the LRM-20 to an LRM-15. The aft SRM launcher is swapped for a single medium laser, which leaves enough free tonnage for an extra heat sink. Due to the peculiarities of weapon abstraction for aerospace fighters, you end up with 1 point more damage in the nose and aft.
Shilone SL-17Y
Mass: 65 tons
Frame: Unknown
Power Plant: 260 Fusion
Armor: Standard
Armament:
3 Medium Laser
1 LRM 15
1 Binary Laser (Blazer) Cannon
Manufacturer: Unknown
Primary Factory: Unknown
Communication System: Unknown
Targeting & Tracking System: Unknown
Introduction Year: 2900
Tech Rating/Availability: D/X-E-E-D
Cost: 3,372,545 C-bills
Type: Shilone
Technology Base: Inner Sphere (Standard)
Tonnage: 65
Battle Value: 1,292
Equipment Mass
Engine 260 Fusion 13.5
Safe Thrust: 6
Max Thrust: 9
Structural Integrity: 6
Heat Sinks: 21 11
Fuel: 400 5.0
Cockpit 3
Armor Factor 184 11.5
Armor
Value
Nose 60
Wings 44/44
Aft 36
Weapons
and Ammo Location Tonnage Heat SRV MRV LRV ERV
Medium Laser RWG 1.0 3 5 0 0 0
LRM 15 NOS 7.0 5 9 9 9 0
Binary Laser Cannon NOS 9.0 16 12 12 0 0
LRM 15 Ammo (16) FSLG 2.0 - - - - -
Medium Laser LWG 1.0 3 5 0 0 0
Medium Laser AFT 1.0 3 5 0 0 0