Digital.Complex: G&G AR Hapa (custom build) - Digital.Complex

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G&G AR Hapa (custom build)

#1 User is offline   aotsukisho 

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Posted 18 July 2020 - 01:06 PM

Got this receiver set awhile back and was musing about what to put in it, fortunately for me I received a commission for a lower end build that this will seem perfect for.

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Here's a photo of the receivers mated up. Both G&G although they came from different models.

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Photo of the other side. Unfortunately it has an ASGI logo on it, oh well

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Unfortunately forgot to take a bunch of photos throughout the build process. This gearbox is a hybrid of components as follows:

- G&G v2 EBB shell. I know it is more fragile than the standard gearbox shell but I am not too worried. This will be a low power build, along with measures taken to minimize impact stress. M110 spring, shock absorber and plastic cylinder head inside. G&G hop unit has a built in shock transfer system on one side.
- CA 18:1 stock gearset. Should not wear out since this gun will not be skirmished - and if it will be, this should be changed to a lower ratio aftermarket set anyway.
- GMT piston/piston head. Great combo, just need to grind off the 2nd and half of the 3rd tooth for AOE correction, and CA glue in the piston rack. Piston head I will be keeping as is, seems to be working fine.
- CA High Torque motor. Ferrous motor, but enough to pull an M110 on stock gear ratio. Any brand stock 'high torque' motor will work, but I chose CA since it will mesh well with the CA gears. I will be pairing this with 3s lipo so power delivery will not be an issue, it cycles just fine.
- SHS steel bushings. One of G&G's bad points are its brass bushings, they are lower friction than steel but they are also softer and will open up and lead to bad gear mesh.
- Gate NanoAAB 3rd gen. Protect the trigger contacts, and provide active braking for positive gearbox rest state.
- SHS ARL, stock G&G isn't of best quality and SHS appears to have a steel ratchet face.

All other parts are G&G stock parts, mostly out of the ARP9 gearbox.

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Testing the shimming

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Work done on the piston rack for AOE correction

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CA glued into the piston body, will use the bearing on the piston head since the spring guide is a basic one.

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Ready for final assembly. Using the G&G Ifrit motor to hold in the ARL

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Ready to assemble the forward half. To be continued.

Still deciding on what rail system and barrel to run. 75% port on the cylinder would mean an M4 length 363mm should work out just fine.
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#2 User is offline   aotsukisho 

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Posted 31 July 2020 - 03:59 PM

Forgot to upload the photos of the chrono. I have delivered the AEG to the client and they are satisfied with the performance.

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Right around 1.2J for a standard type of application.

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Have not tested in full auto as this will likely never be used in full auto, but there is an acceptable variance to shots, 12.19% shown here but in the past eight shots throwing out the outlying 322.1fps reading it is closer to 1.31% variance.

Seems like G&G components are specc'd similar to SHS/GMT parts, and for that I am grateful. Again it shows that a consistent AEG can be had using budget-friendly parts.

Client knows that this is a low-impact gearbox and I am interested to see how long it lasts. When it blows up I will be putting in a standard G&G gearbox in there.
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