How to inspect AK

When you're buying a new AK, it's important to look it over and make sure it's not a broken piece of shit

Things to look for when you're buying a new AK are:
Quality of rivets, are they all flush or are they squished and fucked up?
Is the barrel CHF and chrome lined?*
Are the receiver rails done properly
Is it head spaced properly?**
What is mag lockup like, do they wobble like shit or will they feed properly? Is the cut done right?
Are the sights canted?
Are any other pressed/pinned parts canted?

*Does not apply to US made barrels which are nitrated
**Buy a few gauges for this, they're cheap and you'll use them a lot

Things to look for when buying a used AK
Everything mentioned above
Everything you'd do for a milsurp rifle*
Is the bolt carrier tail squished to shit or does it look proper?
Has the rear of the receiver been beat to shit by the carrier
Is the rivet under the disconnector fucked beyond repair from an aftermarket trigger?

*Things like bore pitting, chamber pitting, rifling wear, overall quality of finish, etc