HAHAHAHAHAHAHAHA
You save 60lbs on a 18,000lb aircraft!
Better to just keep the lousy ammo.
You realize you're carring almost 700lbs of cannon ammo, right? The 60lbs from the tail gun is lost after your first attack.
EDIT: Here's the weight table I made for myself a little while ago. I'll share it. 100% is fuel, for testing purposes.
basic = 750 20mm rounds & 255 30mm rounds
110G-2 basic 100%: 17500 lbs
110G-2 basic (no30mmAmmo) 100%: 17169 lbs
110G-2 basic (no20mmAmmo) 100%: 17137 lbs
110G-2 basic (noAmmo) 100%: 16805 lbs
gunpod = 750 20mm rounds & 255 30mm rounds & 400 20mm rounds
110G-2 gunpod 100%: 18181 lbs
110G-2 gunpod (no20mmAmmo) 100%: 17623 lbs
110G-2 gunpod (noAmmo) 100%: 17292 lbs
Basic 20mm ammo weight = 363 lbs
1x 20mm round = 0.484 lbs
Basic 30mm ammo weight = 331 lbs
1x 30mm round = ~1.3lbs
Gunpod 20mm ammo weight = 195
Total gunpod weight = 681 lbs
empty gunpod by itself = 486 lbs