DJI drones while expensive they are rather user friendly. Some fighters in Ukraine do use them with aftermarket droppers[1]. Payload is limited to a single VOG-17M grenade. Dropper has a light sensor and is triggered by aux light.
They also build custom drones as well. For example there's R18 by Aerorozvidka[2]. Which is largeish octacopter from higher quality hobby parts. Payload is ~5kg which allows taking multiple anti-armor grenades or small mortar rounds.
[1]: https://www.amazon.co.uk/Taoke-Airdrop-Delivery-Foldable-com...
And they are using aftermarket parts that you can order off Amazon for ~$10.
- https://old.reddit.com/r/CombatFootage/comments/wz9j4v/longe...
- https://old.reddit.com/r/CombatFootage/comments/ws554a/drone...
- https://old.reddit.com/r/CombatFootage/comments/wdzgt3/georg...
- https://old.reddit.com/r/CombatFootage/comments/wq5dc4/soldi...
- https://old.reddit.com/r/CombatFootage/comments/ui4vsc/dpr_s...
- https://twitter.com/Osinttechnical/status/155961302344626176...
- https://youtu.be/oOV6Yq-aZNk?t=53
etc etc. literally thousands of videos confirming this.
See: https://old.reddit.com/r/CombatFootage/search?q=dji&restrict...
For more videos
An Air Dropper for a Mavic Air 2 for $30 that uses the AUX light
https://www.amazon.com/Airdrop-Accessories-Delivery-Transpor...
I feel like this implies that they're using DJI/consumer drones. They aren't, those are too expensive and too slow. They use custom-built FPV drones, which are much faster, cheaper, and much easier to build from parts.
The phrase "rigging them up with aftermarket parts" doesn't really apply when the entire drone is "cheap aftermarket parts".