Silverback (40 Newton) APS 13mm Type Spring for SRS & TAC41

Guessing muzzle energy with vaguely labeled aftermarket springs is a fast way to fail a morning chrono check, especially when playing under strict CQB or regional field Joule caps. Rated by an exact 40 Newton mechanical compression force rather than arbitrary velocity estimates, the Silverback 40 Newton APS 13mm Spring gives SRS and TAC41 end-users a predictable energy output alongside a remarkably smooth, low-effort bolt throw. Wound from high-tensile, heat-treated spring steel to resist set and creep over thousands of cycles, its 13mm APS-2 outer diameter features a consistent linear pitch and dual ground-flat ends that eliminate spring torsion and binding inside the piston. Compatible with the Silverback SRS-A1, SRS-A2, TAC41P, TAC41A, and any aftermarket bolt assembly accepting 13mm springs, this drop-in mainspring delivers the quiet, effortless cocking and shot-to-shot consistency needed to stay right under tight limits across UK, European, and Asia-Pacific fields.

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Compatibility:

• Silverback SRS A1/A2 & TAC 41 Spring Powered Sniper Rifle Series

Includes:

• x1 Silverback (40 Newton) APS 13mm Type Spring for SRS & TAC41