The Raptors Airsoft RTQ Steel Enhanced Tight Bore Inner Barrel is a precision-machined upgrade component that can help improve the accuracy and performance of your gas blowback airsoft gun. It is made from high-quality steel and features a 6.02mm inner diameter that provides tighter groupings and improved accuracy. This inner barrel is compatible with most gas blowback airsoft guns, and it can help increase your gun's velocity, range, and overall performance.