Possible yes, but it would need to be larger.
Rotary aircraft utilize spinning blades to create lift. The more surface area available to "beat the air into submission" the more lift you can create. Conversely, the lighter the aircraft, the more effective the blades become.
So the major problems you have to overcome with a weaponized version is weight and recoil.
- Weapons are heavy due to the fuel, payload, and casings required to contain and control combustion.
- Ammunition is heavy and the more you carry the heavier it becomes
- Weapons fire payloads in a direction and experience recoil equally in the opposite direction
Managing weight and recoil requires more power than a few small Li batteries can provide and sustain and the additional weight means the blades used for propulsion either need to increase in size or quantity.
All of this is doable, but the drone will be 3x or 4x the size to house the resources required to manage lift and propulsion, namely larger batteries and additional blade surface area, most likely in the form of additional rotor heads making it more like an octacopter, with larger diameters to minimize noise.
Weapons make noise when they are launched and if you want to make this stealthy, you'll need choose weapons systems carefully and be very mission specific. Suppressed sniper, laser guided missle, etc. You aren't going to load an automatic weapon on one of these, nor will you be mounting rocket pods. Payloads will need to be limited to reduce weight, yet effective for the mission. Which means, these will be modular and configurable depending on the mission parameters.
Typically, this technology is used more for recon and observation due to its small and quiet footprint. The larger the footprint, the more noticeable it becomes. And weaponizing this tech would most definitely require it's footprint to grow, making it ideal at distance to increase its survivability.