This is an aftermarket 300mm inner barrel made by Maple Leaf. These barrels are known to have exceptional performance for the price.
The inside diameter of the barrel is 6.04mm and it's made out of brass (plated).
Crazy Jet stands for the special tip designdeveloped by Maple Leaf. Instead of having a regular crown at the end, it has a double wall design with vent ports which a) reduces the pressure when the BB is exiting the barrel and b) redirects it to form an air tunnel of sorts around the BB - both of which help stablize the BB and increase the accuracy slightly over the standard barrels.
This barrel will has a VSR style groovesmeaning it will be compatible with:
SSG10 / VSR10 spring powered sniper rifles
SSX23 / MK23 non-blowback pistols
This one will be a perfect match for Nano Carbinebuilds as it will slightly increase your power output and extende your range closer to a sniper rifle.
It will also work flawlessly as a short inner barrel for your SSG10.