T-N.T S&T M1903 S+ Retrofit kit 517 mm

Upgrade set for S&T M1903 includes precision barrel and hop-up chamber.

Barrel S + 517mm: the hole for the hop-up bucking is significantly larger. It is thus possible to use a bucking with a large pressure surface, thanks to which it is possible to use heavier BBs. At the mouth, the barrel has grooves - air ducts, which direct the air flow and reduce unwanted turbulence. As a result, the BB has better accuracy. The S + version is characterized by its slightly different design of the hole for the Hop rubber band, which affects differently the way it presses the pressure on the BB than the traditional barrel.

Aluminum CNC one-piece Hop-up chamber made especially for S&T M1903. The chamber contain: aluminum CNC Hop nub and TR-HOP bushing.