There are a lot of AK's in 5.56
It has been a trend for some time. No idea what "AK style assault weapon" is.
Kalashnikov Concern EXPORT AK102:
https://en.wikipedia.org/wiki/AK-102
Arsenal Bulgaria makes a lot of export weapons in 5.56 we have most of them here in he US:
http://www.arsenalinc.com/usa/5.56_NATO/
MOLOT Vepr (Really high quality guns, RPK receivers):
http://www.k-var.com/shop/Vepr-rifles
Norinco 5.56 AKs Type 56-4 (Worth a lot on GB):
https://en.wikipedia.org/wiki/Type_56_assault_rifle
I own a few of the Arsenal Weapons. They work pretty good. Not tack drivers, but general combat weapons. Really depends on ammo.
I highly doubt 25 meter simulated would be difficult with any of them. Setting the sights correctly requires someone that knows what they are doing. Also depends on how new the weapon is as I have dealt with front sight drift before.
Would be interesting to see what they bought.