S+ Air-cushion inner barrel - 520mm
T-N.T. inner barrel series is common platform, has been pre-completed with the side cut groove of AEG, GBB, and VSR, suitable the almost HOP-UP bucking on the market.
●For major brands AEG, GBB.
●Length can be customized.
(There may be a few brands of guns that have special specifications and need to be modified by the customer.)