This polymer replacement part is displayed as part number 126-273 on KM4 series diagrams and functions as the inner barrel through which the bb travels.
The KWA KM4 and RM4 Series semi-tightbore 273mm 6.05mm brass inner barrel is made of the highest quality material and is meticulously crafted to precise specifications. With this inner barrel, you can truly customize your AEG or ERG to to fit any style of game play.
Although this barrel is the stock inner barrel for the KM4 CQB, KM4 Commando, CQR Mod 2, and KM4 SR7, it can be used in any KM4 or RM4 Series rifle! Customize your KM4 or RM4 with our large selection of rail systems and outer barrels. The possibilities are endless!