SOK-12 12/76 MaxRounds Powermag 20-round magazine

The  (Powermag 20) is a magazine in Escape from Tarkov.

Description
MaxRounds Powermag 20-round magazine for SOK-12 and compatible weapons, intended for use with 12/76 or 12/70 shells.

Trading
There is a trade at Mechanic LL4 for this item (but I don't know what it is)