The SI Carbine Flatwire Spring is an economical, easy upgrade to any ar system with a carbine buffer system. The flatwire spring increases service life of the platform, smooths out the shooting cycle, and greatly outlasts the stock spring. Increased bolt
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So I got a Flat Wire spring Strike Industires AR Carbine Flatwire Spring
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KynShot Tube Kit: Kyntec KynSHOT Hydraulic Buffer + Recoil Technologies Mil-Spec 6-Position Buffer Kit + Gauntlet Arms SOPMOD Stock