ARP9 3.0 With XX-Mod HPA Engine

£275.00

Additional Info

Item ConditionUsed-Very Good
MakeG&G/Mechlabs
ModelARP9 3.0/XX-Mod
Weapon TypeHPA
FPS (Approximately)350 - 400 FPS
Swaps/TradesNo
Collection/DeliveryPost or Collect
Postage Cost10

I’m looking to sell an ARP9 3.0 that has had its gearbox replaced with a Mechlabs XX-Mod HPA engine.

I’m selling this one to cover the cost of upgrading my primary rifle further, as well as saving for a Gate PTX eventually.

The original stock was removed and i used a picatinny adapter that screws into the back of the gearbox/engine to mount a retractable one in its place.

The XX-Mod engine is fully mechanical and also capable of full-auto fire, although it can a bit finnicky to get properly aligned inside the receiver – it has no way of adjusting the rate of fire, but the nozzle length, airflow and horizontal/vertical alignment can all be adjusted with a few grub screws & allen keys.
The selector plate can also be swapped out for a semi only one if desired.

The gun will also come with an extended thread adapter so you can mount your choice of muzzle devices past the handguard, as well as x6 of the short quad-feed magazines (x68 rounds) and a 1200 round manually wound drum.

I am looking for £275 for the bundle, plus £10 postage.

Please feel free to message me with any questions.

Listing ID: 46169b7d73578f37

March 28, 2026 10:55 am

4 days, 14 hours