The yellow reduced power buffer spring by SpinCo is a precisely engineered solution for firearms enthusiasts aiming for optimal performance with reduced power loads. Developed in collaboration with two leading commercial ammunition manufacturers and renowned gunsmiths, this spring has undergone extensive testing and evaluation. It is approximately 20% lighter than the White counterpart, making it the preferred choice among four different prototypes tested by industry experts. Designed for firearms requiring a lighter buffer spring, the Yellow spring ensures reliable cycling and performance. For optimal functionality, consider enlarging the gas port if your firearm demands a lighter spring, enhancing overall reliability and seamless operation. Ideal for use with low power SRTA training rounds or SIMS rounds, the Yellow spring is perfect for training operations where reduced power loads are necessary. Experience the precision and reliability of Sprinco's yellow reduced power buffer spring, crafted to meet the demands of both professional and recreational shooters. The Reduced Power buffer spring from Sprinco USA, referred to as the yellow spring, is approximately 20% lighter than the white spring The yellow spring was developed in collaboration with ammunition manufacturers and gunsmiths It emerged as the preferred choice among four samples For firearms necessitating a lighter spring, it is advisable to enlarge the gas port to enhance reliability The yellow spring is appropriate for use with low-power training rounds