The Ledger shows the modification done to a Tokyo Marui AKM Gas Blowback Rifle, enabling a single fill of Green Gas into the magazine that makes it feed 4 times the amount, over 200 BBs. This can help in saving on green gas costs. A favorite among AK variants, the AKM, is now a gas blowback machine gun courtesy of Tokyo Marui. It features a realistic wood grain finish, parts meticulously reproduced from real steel, an auto stop for authentic operation, and delivers a powerful recoil with impressive durability.