For the WE pattern GBBR M4, this precision barrel offers a tighter tolerances to squeeze out power more consistently by reducing the variance in pellet pathway and improving the seal of pressure behind it.
Approximately 260mm in length, stainless steel inner barrel for WE GBBR M4.
This is for closed bolt system.
Disclaimer: All aftermarket upgrade parts require necessary skill or modification to install and assemble, please consult with your airsoft technician if needed.