Laylax put out this video showing how to install their custom inner barrel made for the Tokyo Marui AKM Gas Blowback Rifle. The F.FACTORY brand offers a stainless steel inner barrel designed specifically for Tokyo Marui gas blowback machine guns, including the AKM and AKX models. The barrel, with a length of 200mm and an inner diameter of φ6.03mm, boasts a high precision tolerance of ±0.01mm.

This precision minimizes BB deviation within the barrel, thereby contributing to a stable muzzle velocity. It's important to note that the barrel should be cleaned before use and only fresh BBs should be used. Fired or dropped BBs can cause jams due to the tight inner diameter of the barrel. The product's material is Stainless Steel (SUS) and its JAN code is 4571443188878.