"A fully automatic assault rifle. This knock-off of an iron curtain rifle has a large magazine that holds 18 bullets."
An Assault Rifle is a weapon found in Silent Hill: Origins. The weapon fires 7.62 millimeter rounds in rapid succession. Ammunition for the assault rifle is scarce, but can be found if one takes the time to look for it. It can be found in Andy's Books.
It resembles an AK-47, only a little more polished and with a smaller magazine which reflects its status as an imitation. This may be an anachronism because civilian AK type rifles entered US market after 1982, and Origins is presumably set in the 1970s.