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If you buy a GHK AK, don't get it from Evike, they send both me and a friend old stock from when they first introduced their current system. Buy from somewhere in Canada, or sites like Samoon.

Now, for starters, expect the stock hop-up chamber to break pretty early. Not immediately, but early. Running stock, the GHK AK line runs AEG barrels and buckings. If you prefer to use those, you can get CNC'd hop chambers. If you want slightly better accuracy, you can buy the GBL or TNT hop-up units. They use TM-style sniper rifle inner barrels and buckings. However, these are much more expensive, especially TNT.

The bolt (not the bolt carrier) will wear out eventually: have extras. The O-rings will go bad over time as well: have extras. I'm not sure if new production guns have steel internals. However, you may want to replace the hammer and sear with steel versions.

Look up the Devilhunter mod if you want to run refillable CO2.