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What should I be looking for? What price should I expect to pay for a reasonably kept example? I am super fastidious when it comes to parts and pieces and manuals and tools. I like factory and I like all the shit it came with. What should I make sure it has?
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There's 5 types of preban AUG's.
Early green 20"
Late green 20"
Black 16"
Special Receiver
A2 Conversions
The last three will cost the most, with A2's and SR's being rare and really expensive.
The green 20" A1's are a classic example of the AUG, and are what I would recommend. Honestly between early and late versions of the 20" guns, either will treat you well. There is a tendency for buyers to seek out the later 20" guns, but I really appreciate the original open flash hiders look on the early guns.
For a reasonably kept green 20" example, I wouldn't pay more than $2500 for one that I
really want. If you take your time to search, you can buy for much less than $2500 as a shooter.
Now if you're looking for an AUG with the original box, test target, manual, scope adjustment tool, sling, cleaning kit, and cover, a nice example will probably push you toward $3000.
One thing to know is that everything but the original box can be found for sale today. I personally wouldn't worry too much about accessories as you can buy them apart from the gun. What I would look at is overall condition and matching serial numbers.
Best of luck in finding what you want.