Silverback APS 13mm type spring 40 Newtons (for SRS and TAC-41)

This spring is following the “APS 13 mm standard” (for 9 mm outside diameter spring guide). It will fit any rifle compatible with this standard, including all SRS (except push mechanism) and all TAC-41. . This spring received a black electrophoresis coating, and a laser marking to quickly identify the spring.