Matrix "Universal Feeding" Full Metal 500rd Hi-Cap M4 AEG MagazineHigh quality stamped metal constructionCompatible with a wide range of different brands and types of Airsoft gunsExtended capacity, holds a greater amount of BB's compared to standard Hi-Cap magsSmooth feeding designTested to fit and feed with the following: KWA, G&G;, ICS, JG, Echo1, Matrix, King Arms, Elite Force, ARES, Top Tech, Bolt, A&K;, Dytac, Avengers, 6mmProShop, G&P;, VFC, Dboys, AGM, G36 Mag Well Conversion, P90 Box Mag Conversion and various other brands