Way back in the good 'ol days----when ammo was CHEAP.
Before I replaced the wooden handguard on my SKS D model (takes AK
mags) with a perforated metal handguard:
120 fast rounds---4 30 rd magazines---the handguard would catch fire,
and the barrel would get so hot it looked gray instead of blue.
Saw a guy run around 200 rds through a AK shorty full auto as fast as
he could change mags---then light a cigarette on the barrel.