I would go with the following for a less obviously illegal drone (using the drone mod rules). This is the new, unmodified Roto-Drone:
| NAME | HANDL | SPEED | ACCEL | BODY | ARMOR | PILOT | SENS | AVAIL | COST | REF |
| MCT-Nissan Roto-Drone (Large) | 4 | 2R | 1 | 4(4) | 6 | 3 | 3 | 6 | 8,000¥ | p. 466, SR5 |
So we've got 4 mod points to start, and an additional 3 for weapon mods. It's already got decent handling and body, and with a long-range weapon it shouldn't have to evade too many shots or soak too many hits so we'll leave that where it is.
We'll use a free mod point to upgrade speed to 3R for (Speed 3 * Body 4 * 200¥) 2,400¥ at Avail 6, and do the same for Acceleration 2 for (Acceleration 2 * Body 4 * 200¥) 1,600¥ at avail 8.
Just to be safe, we'll upgrade Armor from 6 to 12 for 1 MP (6 to 9 for free, 9 to 12 costs 1 MP), for a cost of (AV 12 * Body 4 * 200¥) 9,600¥ and avail 12R. Since Body 4 * 3 = 12 we're not suffering any reductions in handling or speed.
If the drone will be used by a rigger one might consider sensor upgrades, but as a fire support drone operating autonomously it can do just fine with the accuracy of the weapon, so we'll leave this alone.
We do want a smarter pilot, so we'll get Pilot 4 for 3,200¥ at avail 12R.
This gets us the following:
| NAME | HANDL | SPEED | ACCEL | BODY | ARMOR | PILOT | SENS | AVAIL | COST | REF |
| MCT-Nissan Roto-Drone (Large) | 4 | 3R | 2 | 4(3) | 12 | 4 | 3 | 12R | 24,800¥ | p. 466, SR5 |
This leaves us 6 MPs for weapon mounts, which is enough for a Large (4MP), Pop-Out (1MP) Mount with a second ammunition bin (1MP), for a total of ((4MP * 800¥) + (5 MP * 100¥) + 50¥) 3,750¥, and we'll mount one of the Sporting Rifles from Gun Heaven as we can't technically fit a sniper rifle, and we want a range advantage. My choice would be a Springfield M1A for a good combination of power, ammo, and AP, or a Marlin X71 if you want more AP at the cost of less ammunition. Add a smartsoft and a targeting 4 autosoft and you've got a fast and relatively maneuverable drone that can a) provide fire support from up to 500m away and still roll 10 dice on the attack with two take aim actions, b) switch from non-lethal to lethal ammunition on short notice, and c) appear like a legal drone for all intents and purposes without close scrutiny, all for less than 35k (25k if you don't upgrade the AV).
Slaving the drone to an RCC running targeting 6 for another 2 dice, and you could always fit an assault rifle for suppressive fire options instead.