Laylax demo the easy installation of the Tokyo Marui MP7A1 Custom Outer Barrel + Short SAS under their Nineball brand... "This outer barrel and 14mm reverse thread adapter set is compatible with both electric and gas blowback guns for the Tokyo Marui MP7A1. Eliminating the step inside the outer barrel allows for the use of a longer inner barrel* than the factory version, expanding customization possibilities. Furthermore, the included 14mm reverse thread adapter is shorter than the factory version, eliminating any gaps between the barrel and the main body when attaching a silencer or other accessory, resulting in a more integrated and stylish look. It is made of lightweight, high-strength aluminum alloy and machined with high precision."