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Keep in mind the best you'll get for consistant accuracy at 20ft is within an inch or so. Don't expect to be able to dump 20 shots into a single 6mm hole, even at 20 or 10ft, you won't get it. Another thing to keep in mind is that even if you are using expensive match grade ammo in your AEG, the BBs will STILL go where they want to. AEGs are like that, you can get superb accuracy all the time like real steel. Under the same conditions every time with my M700 (dry swab the barrel, fill mag with propane, fire 4 dry fire shots to even the presssure out, load with 0.29g Super Grand Master BBs........... about $25 for 500.........) I can get all 10 shots onto paper at 30ft, and make a hole the size of a dime.
A tightbore isn't going to solve all your problems though. It'll help tighten your groups up a bit, good hop up unit and rubber will help as well. I find it really odd that your gun is so in accurate though. I mean, not being able to get all shots onto a CD at 20ft? Something is really wrong there. My Glock 19 gets tighter groups than that at 30ft. And it shouldn't be more accurate than an AEG.
Hop up: Should be easy enough for you to do yoruself, just have to pay attention. Not sure how different AKs are from other guns as far as hop up unit goes. There's a half circle clip on the front part that holds the barrel in the hop up. Pop that off, gently twist the barrel and hope the rubber sleeve comes out nicely. Keep in mind there that little 'packing' (little rubber cylinder, about 1/8" long) inside the hop up unit. Tap the unit on a table with full hop up set, it should fall out. Take the new packing, hold the unit upside down, roll the packing in there, and with a small screwdriver poking in form the opposite side, position the packing sideways and into the square hole. Once in there, move the hop up adjust up & down, make sure that packing move up and down also. Put the sleeve over your barrel, inside nub into the barrel's square hole, put a thin layer of silocon oil on the outside of the sleeve, and holding the hop up unit upside down (hop up full off), slide the barrel and sleeve into the hop up unit. Once it's in there, look down the barrel and point the other end at a white wall, move the hop up to full and back again and see if you are getting the rubber into the barrel nicely. Once done, put that semi circular clip back on, then reinstall into your gun.
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