Sadly, the nice guarder front grip pin isn't exactly compatible with the CA AUG, since the TM front handle is glued plastic, made of two halves and the CA one is bonded fiberglass.
Advice for a new AUG user:
1. Front handle: Don't fall on the front handle/barrel like Tenneal did, since the only real way to replace the front handle if you break it is to find a TM one that you can put the guarder pin in (if it even works with the holes it pokes into on the CA, which has not been confirmed. The pin size may be uncompatible.)
2. Hop Up: The hop up unit is fine until you break it. Some users do, but this can be avoided simply by being careful when removing the barrel not to catch the unit on any of the springs or levers inside the body (again, like Tenneal did :P).
The PDC hop up unit is great, and worth the price, but not easy to come by, or necessary by any remote means. It is an upgrade unit, the G&P one is a metal replacement. All signs indicate that the PDC one will actually improve performance. At the very least it is much, much more sensitive to adjust the hop up with.
A new hop up rubber is without question the first upgrade (and only really necessary one) you should do right off the bat. The Guarder silicone one is excellent for the CA AUG, if you get the PDC unit, you're better off with a Systema black one though, because you will never get a Guarder clear one out of the hop up unit again without ruining it.
3. If the AUG is too long for you, don't get a new gun, just get a new shorty outer barrel, then you can have an AEG the length of an Mp5 with an M4 barrel.
4. Sling Points: Sling point squeak can be fixed with a little graphite lube ($7 at Canadian Tire). The unusual sling points work alright with a 3-point sling, but do catch from time to time on the bolt handle. (Good point about stresses, Shinjin)
5. Selector mechanism: Sadly the electrical arcing problem is one that will wear down the trigger of any V.3 AEG until you put a MOSFET switch in it. Not a necessary upgrade, but it may become one if your trigger switch arcs to nothing.
In the CA, you shouldn't have to worry about forcing the gearbox forwards, the rear plate in the back of the gun has a rubber bumper that does that well.
There is also a plastic bit in the gearbox that is activated by a sharp metal bit that allows you to use Semi-Auto in a version 3 gearbox (if that supplies a decent mental image of what goes on in the gun

). This part has worn from a 90 degree step shaped catch down to a 45 degree ramp in
all CA AUGs that I've seen used locally for more than about a year. This is a pain in the ass to fix, but is doable. I have yet to find a replacement part for this short of buying a new gearbox.
You will probably greatly enjoy your CA AUG. It's a great rifle overall and will outperform the competition with only a bit of work and money (though obviously it's not hard to put lots of both into it).
Edit:
Quote:
Originally Posted by Shinjin_MC
stuffing the foregrip with some kind of material also takes away the 'twang,' which I found quite annoying
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Thanks for that advice, I just did it and it works wonders!