Adjustable, Injection Molded, and pre-assembled. This one checks all the boxes. The easiest way to add a durable and adjustable scar barrel to most blasters. Fits on Worker Aluminum barrel nicely. Will fit on Talonclaw/Caliburn/Lynx Barrel material, but is a very tight fit. Please remember to untwist your scar barrel after use so the strings do not stay stretched during storage. Includes Scar Barrel (pre-strung), Instruction sheet and Extra String.