Most of Classic Arms guns ARE from CIA. These look like part of the last batch of CETME rifles that CIA built after they ran out of good CETME wood stocks and slapped some US made G-3 stocks on them. The last batch were mostly ground-bolt versions as I understand, which means instead of putting new rollers and locking-shoulders in them to fix head-space issues, they ground the back of the bolt-heads down to give them the proper head-space. I would suggest passing on these unless you can check and inspect the head-space.
A little tip on this.
You CANNOT check the head-space on a roller-locked action with no-go gauges. You need a set of feeler gauges (like you use for checking the gap on a spark plug).
Step 1) remove the magazine and lock the bolt back in the manual bolt-hold
Step 2) CHECK THE CHAMBER (make sure it's unloaded)
Step 3) slap the charging handle down (do NOT ease it down)
Step 4) pull the trigger to drop the hammer
Step 5) turn the weapon over and look into the mag-well
Step 6) use the feeler gauge between the bolt-head and bolt-carrier
the bolt gap on a 7.62x51mm NATO rifle (CETME/H&K/PTR) should be between .004 and .012 inches {.1mm and .5mm} (between .008 and .016 inches is optimal however, outside of these you probably should change the rollers, locking shoulder or even the bolt-head), I have heard the 5.56x45mm NATO versions should run between .010 and .020 inches but I cannot confirm that.
On a personal note, I don't like the 5.56 versions of the H&K. The desire to use as many parts between the various versions of the H&K system led to the '93 being excessively heavy and bulky. I myself would look to the AK-74, either in the original 5.45x39mm or 5.56. Magazines are a bit of an issue with the 5.56 (to say nothing of ammo prices) as there was and is no standard for the 5.56mm magazines there tends to be dimensional differences between the various 5.56mm AK mags. The 5.45mm was standardized by the Soviets so everybody's mags tend to work in everybody else's guns.