Disposable means if I were a gangbanger and used my $400 AK to off some bi-yatches, I'd take it to the nearest automotive chop shop that I feed with my usual activities and have the barrel and bolt melted to a puddle of liquid hot magma so I couldn't be fingered with the weapon even if I were a suspect, then dump the remaining parts into the nearest ocean water.
Although... if I used an SKS, I could off twice as many bi-yatches and melt down the gun for less cost per bi-yatch that I capped.