Description
Ace 1 Arms HPA AR/M4 Airsoft Rifle – Standard ETU
This is the standard ETU (electronic trigger unit) for the Ace 1 Arms HPA AR/M4 airsoft rifle. The ETU is the electronic heart of the rifle: it reads the trigger and selector and controls the firing of each shot.
Having the right spares on hand keeps an HPA rifle running between games, and genuine parts made for your rifle are the simplest way to be sure of a good fit. We list a range of Ace 1 Arms spares for this rifle, including ETUs, inner barrels, a nozzle and a selector switch, so you can maintain, repair or adapt your rifle without hunting around.
What it does
We list two Ace 1 Arms ETUs for this rifle: this standard unit and a semi-only version. The semi-only unit is designed for single-shot use, while the standard unit is the general-purpose option. Please check the product photos or contact us to confirm the fire modes and settings of this unit before ordering.
A spare ETU is useful if the original has been damaged, for example by water or a short circuit, or if you want to switch a semi-only rifle back to standard use.
Fitting and setting up
Disconnect and de-gas the air and remove the battery before you start. ETU installation usually involves opening the lower receiver and connecting wiring, so follow the rifle’s manual closely and take care not to trap or pinch wires when reassembling.
After fitting, check that the rifle is safe on safe and behaves correctly in each position before reconnecting the air, then test at low pressure and check the velocity on a chronograph before play.
Key features
- Standard ETU for the Ace 1 Arms HPA AR/M4 rifle
- Reads the trigger and selector and controls each shot
- General-purpose alternative to the semi-only unit
- Useful replacement after damage
- Genuine Ace 1 Arms part
Compatibility
This part is listed for the Ace 1 Arms HPA AR/M4 airsoft rifle sold in our shop. It is not listed as a universal part, so please check your rifle’s make and model before ordering. A semi-only ETU is listed separately.
Care and maintenance
Keep the ETU and wiring dry, and dry the rifle thoroughly after wet games before storing it. Remove the battery when the rifle is stored, and never leave a battery connected for long periods.
Work on the rifle only with the air disconnected and the line de-gassed, and keep small parts in a tray so nothing goes missing. Keep spare parts in their packaging, somewhere clean and dry, until you need them. Use good quality seamless 6mm BBs, as dirt and damaged BBs are the main cause of jams and wear in any airsoft rifle.
Who is it for?
This ETU suits owners of the Ace 1 Arms HPA AR/M4 rifle who need a replacement unit, or who want to return a semi-only rifle to standard operation.
Please note: We are unable to list further technical details for this part; please check the product photos or contact us before ordering if you need to confirm fitment. Fitting parts to an HPA rifle should be done with the air disconnected and de-gassed; if you are not confident, ask a qualified airsoft technician.
