Its the Czechoslovakian Vz 58 7.62x39mm assault rifle. Looks like an AK-47 clone but has a completely different internal operation. Australian Army used to use it as an OPFOR rifle until buying spares and ammo was defunded 10 years ago (we are now trying to buy a brand new OPFOR rifle!).
The magazine in the first picture is a standard one. Here you've got another view of the vz.58:
Actually the rifle in question is the vz.58's variant designated in Czechoslovakia as 7, 62 mm samopal vz.58 Pi - it has a flash hider, light bipod and wooden stock. The version could have used an IR device as well.