Replacement Spring Set for the FRT-15C3™ ensures reliable performance for your MP5 or HK clone forced reset trigger system. This USA-made kit includes three precision springs: hammer spring, trigger spring, and disconnector spring – all manufactured to Rare Breed Triggers’ exacting standards for durability and consistent reset function.
Compatible with MP5 FRT builds and HK clone platforms, these springs maintain proper tension for smooth operation. Constructed from high-grade spring steel with corrosion-resistant finish. Direct replacement for worn or damaged components in your FRT-15C3™ system.
Rare Breed Triggers delivers proven reliability for serious shooters. Complete your MP5 FRT build with these essential replacement parts.




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