Maple Leaf Crazy Jet 138mm for WE Hi-capa 6″

Maple Leaf Crazy Jet inner barrel (138mm) suitable for WE Hi-Capa 6″.
Interesting concept which uses a gap towards the end of the inner barrel which allows some gas to pass the BB and then accelerate in front creating a cushion of moving gas for the BB to travel within.
In theory this should then create an improvement in range and accuracy