Double Bell M4 Stainless Steel Barrel The double bell stainless steel barrel is a great upgrade for many blasters or for those that need a replacement for their Double Bell gel blaster. They are a high-quality stainless steel, ensuring a smooth, polished interior that will help the gels slide through with ease. Also being a 7.3 ( /- 0.1mm) mm inner diameter will give you a good performing blaster due to better compression from your barrel. Please note that these Double Bell inner barrels have a smaller outer diameter than your standard inner barrels, so they will not fit in most gel blasters, unless you have the corresponding outer barrels and T-Pieces. Length: 385 mm
