If the costs of the WA M4 GBB Magazines is keeping you from buying the GBB M4, you can make an easier decision by pre-ordering the Bomber 50 round magazines at Airsoft Global which will cost US$50 more than half the price of the WA magazines. It Will be available at Mid of April Suitable For WA/ Inokatsu M4 Series. Die casting Aluminum with Full Upgraded Material. Hold 134a/ Top Gas Reliably and with Blow-lock back function.