Low level pistol users should try to acquire the Stinger II from Cole while on Eden Prime, as it is a big improvement over the Kessler players start with.
Mid level players can then trade up for a Raikou, as it is clearly the best pistol available at this level.
High level characters should try to acquire an HMWP, but failing this the Karpov is a good choice, as is the Brawler, which does less damage but can fire more shots before overheating.
Ariake Technologies I II III IV V VI VII VIII IX X
DMG Raikou - - - 163 173 182 192 202 211 221
SBO - - - 18 19 20 21 22 23 24
ACC - - - 63 64 65 66 66 67 68
Armax Arsenal I II III IV V VI VII VIII IX X
DMG Brawler - - - - - - 208 218 229 239
SBO - - - - - - 25 26 28 31
ACC - - - - - - 77 77 78 79
Devlon Industries I II III IV V VI VII VIII IX X
DMG Stinger - 132 - 150 158 167 176 185 194 202
SBO - 17 - 19 20 21 22 23 25 26
ACC - 65 - 66 67 68 69 69 70 71
Elanus Risk Control I II III IV V VI VII VIII IX X
DMG Striker 101 108 115 122 130 137 144 151 158 166
SBO 14 14 15 16 16 17 18 18 19 20
ACC 47 48 49 51 52 53 54 55 56 57
Elkoss Combine I II III IV V VI VII VIII IX X
DMG Edge 112 120 128 136 144 152 160 168 176 184
SBO 13 14 14 15 16 16 17 18 18 19
ACC 38 39 40 42 43 44 45 47 48 49
Hahne-Kedar I II III IV V VI VII VIII IX X
DMG Kessler 90 96 102 109 115 122 128 134 141 147
SBO 14 15 16 16 17 18 19 19 20 22
ACC 52 53 54 55 56 57 58 59 60 61
Haliat Armory I II III IV V VI VII VIII IX X
DMG Stiletto - - - 177 187 198 208 218 229 239
SBO - - - 17 18 19 19 21 22 23
ACC - - - 60 60 61 62 63 64 65
Kassa Fabrication I II III IV V VI VII VIII IX X
DMG Razer - - - - - - 224 235 246 258
SBO - - - - - - 23 25 26 28
ACC - - - - - - 75 75 76 77
Rosenkov Materials I II III IV V VI VII VIII IX X
DMG Karpov - - - - - - 240 252 264 276
SBO - - - - - - 22 23 25 26
ACC - - - - - - 73 73 74 75
Spectre - Master Gear I II III IV V VI VII VIII IX X
DMG HMWP - - - - - - 256 - - 294
SBO - - - - - - 24 - - 29
ACC - - - - - - 87 - - 88