GSI NTB Non-Tilting Outer Barrel for Tokyo Marui G17 Gen 3Introducing the NTB for MARUI G17 Gen3, the must have accessory to enhance your airsoft experience. This NTB allows you to attach accessories such as a silencer and auto tracer unit without compromising the operability of your airsoft gun. With no interference with the slide, you can expect faster operation and increased gas efficiency, resulting in a higher number of shots. Additionally, the inner barrel can be extended with this NTB, allowing for