M39A2 / A3 20mm cannons are amongst the weapons for which AEIS offer complete spares support, upgrades and supply.

AEIS offer an extensive range of equipment associated with fire products. Instrumental trials record a wide variety of data collected by various means: for example, Skyscreen's monitor projectile velocity and rate of fire.
WEAPON DYNAMICS MONITORING
AEIS also has the capacity to monitor weapon dynamics with kinematic equipment, which utilises rotary and linear displacement transducers linked to a kinematic computer. Here, recordings are captured every 4µs. The results are analysed using DaDiSP software.
AEIS offer complete spares support, upgrades and supply of the following weapons:
* Aden 30mm cannons
* Minigun
* Aden 25mm cannons
* DEFA 30mm cannons
* M39A2 / A3 20mm cannons