Archwick B&T Licensed APC9 Series GBB SMG 30rds Gas Magazine
 
Mainly Made By Aluminum, Polymer, Rubber
Compatibility: B&T AIR  APC9 Series GBB SMGs
Come with a rubber baseplate to protect your magazine from drops.
H134a (8kgs) / Top Gas (12kgs) 
Archwick : BTA-MG-APC9-G2