Selling a AK Gas blowback magazine for WE GBB Aks This uses Green gas or propane. If you own a WE GBB AK, you’ll know that these are out of stock at most retailers for the majority of the year due to high demand and low stock. Here’s your chance to get a great condition gas mag. Mag works great, holds gas well. Sold my Gas AK and don’t have a need for this. Will be shipped Priority Mail, arrives in 2-4 days.