Ok, from every review I read the ak is more accurate, only larger. However, my brother's mp5 has better groupings close up, (almost 2 inches more) and slightly better at 75 ft. I cleaned my ak47 barrel, and my groupings improved, but what's going on? is the mo5 jut more accurate, or did I get a lemon, or is there a problem with my hopup? or something else?
Thanks.

You have to understand, with any clone, the quality control is going to differ gun to gun from batch to batch. All you can hope for it you get a good one.

So I got a bad gun?

Sure sounds like it.

Replace your bucking and maybe get a tightbore. That should fix your accuracy problem.

I wouldn't say that you got a bad gun, not at all. You just need to use high quality BB's (only assuming you're not using high quality). A friend of mine has it and it shoots really good. It's stock, and it shoots pretty accurately up to 120 - 130 feet. It doesn't have incredible groupings, but it's okay. What people also say in reviews isn't always 100% accurate about the groupings. It varies from person to person. Wind, BB's, temperatures, etc.

Yeah, I had been using black ae bbs, but I wanted to seem my groupings so we used the crosman .2's for my pistol. There were times (when we were shooting at a human target around 150 ft) that is would almost be going completely left or right. Is that because of the bucking?

If all else fails get a new hop up unit.

CM028's have to have the hopup unit's replaced to use a tightbore, they aren't TM compatible for some reason.

Ok, thanks for the heads up, I'm gald I didn't buy one before knowing that!

Just realign your hop-up and barrel and it should be fine. You don't need to replace anything for it to be more accurate than the mp5.

Great, but I'm just starting out with airsoft, and I don't know how to do any of that. I also have a new bucking that I'd like to put in if there's a guide on how to do that. I haven't been able to find any on ak47's.
Do you guys know of one?