Lambda Japan added more to their Smart Barrel Inner Barrel series. The Smart Barrel VSR NB is made of Carbon Steel and  they cut the bridge for the custom barrel due to requests from their European customers... "This series is 6.03mm Inner Dia. This shape is customer's request. Many customers asked to us so we started selling as regular lined up. SMART BARREL is lower cost model but keep quality.

Lambda Japan announce the release of their "Smart Barrel" a series of upgrade inner barrels and are lower in cost. Made of Carbon Steel, these are 6.03 inner diametre inner barels and have process plating to prevent rust from forming. Lengts available are 247mm, 275mm, 303mm, 363mm, 420mm, 455mm, 509mm, 469mm, and 595mm.