Good spring for the money - Aero Precision AR15 Carbine Recoil Buffer Spring

I bought this for a biuld and it works as it should. Its just a buffer spring, they all come from the same apring makers. Price is the factor not te name thats on the package. You should change springs often for the price bases on how much you shoot. its much like the BCG pivot pin.. jist change small ceirical parts often