Right in the beginning of the game, Dennis tells you it's important to take radio towers because you can get guns for free in stores as a result. He's awfully unspecific as to how exactly this works, though.
Does each radio tower you enable, regardless of location, make free your bottom-most not-free tier of weapons, or do specific towers make specific weapons free, or what?
Furthermore, does taking over the towers have any effect on which weapons unlock (but still cost money) or which customization options are available for weapons?
Best Answer
I found a tower weapon unlock list here:
Handguns
1911
6P9
.44 Magnum – Requires 11 Radio Tower unlocks.
D50 – Requires 12 Radio Tower unlocks.
SMGs
Skorpion – Requires 2 Radio Tower unlocks.
A2000 – Requires 5 Radio Tower unlocks.
MP5 – Requires 9 Radio Tower unlocks.
BZ19 – Requires 14 Radio Tower unlocks.
Vector .45 ACP – Requires 12 Radio Tower unlocks.
Shotguns
M133 – Requires 5 Radio Tower unlocks.
1887 – Requires 4 Radio Tower unlocks.
SPAS-12 – Requires 13 Radio Tower unlocks.
Assault Rifles
AK47 – Requires 2 Radio Tower unlocks.
STG-90
F1 – Requires 8 Radio Tower unlocks.
MS16 – Requires 10 Radio Tower unlocks.
P416 – Requires 15 Radio Tower unlocks.
ACE – Requires 13 Radio Tower unlocks.
Bushman – Signature Weapon. Requires 18 Radio Tower Unlocks
Sniper Rifles
SVD – Requires 3 Radio Tower unlocks.
M-700 – Requires 6 Radio Tower unlocks.
Z93 – Requires 15 Radio Tower unlocks.
LMG’s
PKM – Requires 4 Radio Tower unlocks.
U100 – Requires 7 Radio Tower unlocks.
MKG – Requires 14 Radio Tower unlocks.
Launchers
RPG-7 – Requires 6 Radio Tower unlocks.
GL-94 – Requires 8 Radio Tower unlocks.
Specials - Repair Tool – Requires 2 Radio Tower unlocks.
Flare Gun – Requires 7 Radio Tower unlocks.
Recurve Bow – Requires 3 Radio Tower unlocks.
Flamethrower – Requires 5 Radio Tower unlocks.