SPRINCO Reduced Power Buffer Spring - AR-15 Carbine (Yellow)For 9mm AR with 3 - 6" barrel that won't cycle with a stronger spring
After extensive testing and evaluation, we have sourced the highest quality buffer springs from Sprinco USA that are properly matched in strength for 9mm applications. They have the strength, consistent performance and long service life that is needed. Stronger springs hold the 9mm bolt in battery properly and reduce bolt velocity which is important for safety, reduced recoil and service life of triggers. The spring is a critical component of the 9mm blow-back system and you need the highest quality and the proper strength for optimal performance. Our Sprinco USA Springs are made from certified Chrome Silicon wire stock to ISO 9001:2008 quality standards to withstand extreme heat and high cyclic rate. This ensures consistency in performance through high round counts. They are precision wound, heat treated, stress relieved and shot peened for extremely long service life and then moly plated for improved corrosion and wear resistance.
In 9mm AR-15s these are recommended for guns with 3-6" barrels if using our 9mm Hydraulic Buffer or our 9mm AKTIVE Buffer if they run too soft to cycle with a stronger spring. We recommend running 9mm ARs with the strongest spring that will cycle reliably. This spring is only for the guns that won't cycle with a stronger spring. Expected service life is in excess of 30,000 rounds.
Changing the buffer spring on an AR-15 is a relatively simple process. Follow these steps to replace the buffer spring: