TNT Studio 6.03mm S+ steel inner barrel for airsoft gun (220mm)

New hi quality steel tempered inner barrel
made by single metal billet and processed by ultra polished finish
the barrel hop window has been ridesigned to minimize the bb contact focusing the gravity center
this wiill avoid speed loss and enhance the hopup effect with minimum adjust....
enlarged hop packing hole and various slots for gas/aeg/bolt rifle system
new aerodynamic ejection system with internal front groove design

inner diameter: 6.03mm
length: 220mm

The New TNT system makes is difference by having in the barrel end a precision groove portion that stabilize the external turboolences, creating just out of the barrel an accurate bb trajectory with longer range and incredible precision.