Spring for SRS and MK13 (M170)
Reinforced spring to increase the power / range of the airsoft sniper rifle.
Primarily designed for Silverback SRS and MK13.
Dimensions: 13 mm outer / 9 mm inner diameter.
SLONG Airsoft
is an airsoft manufacturer in Taiwan producing spare, upgrade parts and accessories such as hop-up chambers, inner barrels, motors, connectors, wiring, parts for gearbox and even outer parts such as handguards and stocks, so you can make a complete AEG just using parts from them. In 2020 SLONG Airsoft released its own M4 AEG rifle.