You talking about the upper handguard---the one that has the piston
tube running through the middle?
I've got an SKS D model Sporter--the one that was made to take AK
mags. 120 fast rounds (4 30 rd mags) and my upper handguard did
burst into flames. Replaced the wood one with a perforated metal
one. No more problems. Now the stock smokes a bit, and the paint
kind of blisters, but the handguard stays tolerably cool.