The Vorsk VM9 Series Extended Magazine 50 Rounds is an airsoft gas blowback (GBB) magazine with an approximate capacity of 48-50 rounds, constructed with a metal body and polymer components. It is designed specifically for the Vorsk VM9 series pistols. 
 
 
Product Details
Capacity: Advertised as 50 rounds, but some retailers list it as 48 rounds.
Construction: Features a durable metal body with polymer feed lips, a polymer follower, and a protective base plate.
Compatibility: This magazine is designed to fit the Vorsk VM9 series GBB pistols, including the VM9 Osiris model.
Gas Type: It is suitable for use with various GBB gases, including green gas, summer gas, and maintenance gas. A separate CO2 version of a Vorsk extended magazine is also available for other Vorsk EU series.
Loading: The magazine can be loaded either with a speed loader or by hand through the feed lips.