Today I will make some personal opinion comments on the data from the previous post.
High-Power Chambering
As expected, high-power chambering did not fair well in terms of pure damage. However, with some examples to look at, it seems the niche for HPC is in low recoil reasonably high damage weapons, assuming you fit enough recoil compensation on the weapon.Ammunition Capacity
The Ares Crusader does slightly more (average) damage than the Ceska Black Scorpion, despite having all the same modifications, due solely to it's slightly larger clip.Recoil
The Ares Viper Slivergun edges out the Ruger Thunderbolt by a small margin (about 4%), but I would personally prefer the latter for it's reduced recoil. The greater chance of hitting the target far outweighs the increase in damage output. Additionally, the Ruger is more likely to do lethal damage due to it's better armour piercing (assuming killing is your thing).
This argument can be made for the M-4A1 Carbine versus the HK 229-X as well.
Holdouts in general suffer from too much recoil when attempting to maximize damage output. Don't expect to score many hits. A compromise in damage, accuracy and concealability is the Fichetti Security 600.
Gyro Stabilization
The Boyd & Richards Desperado isn't a great choice (and the gyro mount option option makes it ridiculous), but it is a shotgun, and is a small package to be able to deploy special shotgun rounds from. In reality the magazine makes it a non-starter for use as a full auto weapon.
I can't say enough good things about the Auto-Assault 16. It does considerable damage, even with few modifications (leaving 5 slots for adding non-damage related toys), and since it's a shotgun can fire a great variety of ammuntion. One option I would suggest would be to forgo the gyro stabilization for a personal grip and auto-adjusting underbarrel weight (for a total recoil 0 and slots 0) making it a little bit more subtle but with just as much stopping power.
The HK G12A4m (personal grip alone gives 1 recoil and 2 slots remaining), Ares PLD (auto-adjusting underbarrel weight gives 0 recoil, 0 slots) and Ingram White Knight (personal grip gives 2 recoil, 3 slots left) can likewise be outfitted to not use the gyro stabilization
Machine Guns
Light, medium and heavy MGs are all nearly perfectly configured off the shelf for dealing death. Little can be done to increase their damage output.
Sourcebooks
In general the War, Gun Heaven and State of the Art 2073 supplements do not increase the lethality of the game that significantly. Once your have incorporated Arsenal in you game, and are modifying weapons (especially with high-velocity), you already have a pretty high damage, lethal game.