Features: –Â 30-round or 120-round capacity for enhanced realism –Â Manufactured by MagPul –Â Flawless feeding design –Â No winding required Specifications: Construction:Â High Strength Polymer Compatibility:Â MagPul KWA PTS RM4 ERG Variants Capacity: 30rds & 120rds (Can be adjusted using the switch on the base plate)