If you are serious about an AUG, It's worth pointing out a few of the flaws, Especially if you have been using an M4 platform.So yeah, the Aug still tempts me.
BB's get into the body on mag changes. With a bit of practice on mag changes you can reduce this. There are options to shim the magwell but it's not needed if you are confident splitting the body. You split invert the body and they just shake out.
The hop unit is good, but it's also built in a different way to an M4 hop. It has to move on the screws that hold the hop to the outer. It's this sprung loaded action that help lock the upper to the lower. I cut my hop rubbers down a little and put the brass ring before the C-clip, as the brass ring in the standard position at the front of the hop unit can reduce the travel of the inner barrel/hop assembly.
Some parts are impossible to buy. Magwell feed nipples, the gearbox trigger mechanism, Motor cage, and the trigger linkage. Be extra careful if you take any of those parts off. The rest of the gearbox is standard V3 bar the air nozzle.
Some inner barrels are too thick. The inner barrel must move in the outer barrel. If you find your after market ones don't slide in without friction and stop the sprung loaded action working then you can't use it.
AUG's are noisy. Your head and ear are over the gearbox and the body of the gun acts like a resonator. You can pack the body with foam to significantly reduce this.
Mags are generally pretty cheap, I've never had a mag that didn't feed correctly even the cheapo battle axe ones. The MAG branded 170rnd mid caps are the best magazine, Good capacity, a bit more expensive but worth it.
Whilst the battery compartment is small you can fit a 7.4v 2200mAh in there (you sometimes have to doctor the dividing plate to get them to fit). I use these in mine.
https://www.componentshop.co.uk/7-4v-2200mah-35c-continuous-discharge-lipo-battery.html?___SID=U
A perfectly built AUG will still have significant wobble between the upper and lower in comparison to an M4.
You can fit a Mosfet in the gun on the inside of the dividing plate if you are clever with wire management.
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