Our take:  This 229mm Tightbore Inner Barrel is manufactured by JBU, known for crafting high quality, performance upgrade airsoft parts and accessories. This inner barrel is perfect for compact "CQB" style AEGs such as the MP5 and AK-47 Beta AEGs.

The super slick performance finish strengthens and protects the barrel, while reducing friction (conserves velocity & back spin).  This 229mm barrel fits most M5 & AK Beta series metal gearbox AEGs.

Precision manufactured to ensure durability and high quality.

JBU & AMS
JBU's inner barrels are made from high tensile,aircraft grade aluminum, using precision CNC machining. These JBU 6.01mmtight bore inner barrels provide maximum accuracy and increased FPS inany AEG. Because these barrels are precision crafted, only high quality,precision grade BBs should be used with this inner barrel. The JBUTight Bore 6.01mm barrel should fit in most AEGs, and should becompatible with most hop up systems. Professional installation isrecommended for anyone unfamiliar with installing a new inner barrel.

Note:  Ready to use right out of the box, though professional installation is recommended/may be required.  Please use only ultra high-quality precision seamless BBs in your gun after installing this barrel, as inferior grade BBs (i.e. BBs from sporting goods stores) WILL jam inside this barrel.

Package weight: 1.6 lb