Buying back items and silenced weapons and other stuff

[beepbeep]

The situation is as follows: at one time I found a Scorpion and a silencer for it, can't remember where anymore.

Some time later I was rewarded for helping a gun runner with a silenced MP5SD5, so like the fool I am I sold the silenced Scorpion because I believed since I now possess a silenced MP5 I had no need for the Scorpion. Not one of my proudest moments.

Imagine my surprise when in the first Olvega mission I ambushed a transport at night and wanted to silently kill off the enemy, only to discover they could see my tracers and hear my shots even though the MP5 is supposed to be silenced. Needless to say I died a pretty gory and quick death.

After digging through the manual I realized I need silenced ammo for silenced weapons to work...

Okay, the questions are:
- is there some way for me to buy the silenced Scorpion or silencer back? even though the gun runner I "think" I sold it to doesn't have it listed...

- Are the boxes I looted permanently empty or will they be eventually refilled?

- Where can I get silenced 9x19 ammo? None of the gun runners or traders are selling them, even though they have all the other versions of 9x19 ammo.

The only silenced ammo I could find is for the Scorpion, but don't have the silencer anymore, nor can I buy it anywhere.

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And what's that about typing "cgl 14" into the console about refreshing the offer of gun stores? I tried in- and out-side of the trade screen, but it doesn't work, not even other numbers after the cgl.

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The manual also says there's some guy in the game that can modify my weapons, but who is he and where can I find him?

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How do I capture towns? Do I just kill all the police and military guards and that's it?