Sprinco M-4 / AR-15 Carbine Enhanced Power Buffer Spring - For Collapsible Stocks (Blue Spring)
This Chrome Silicon recoil spring is made by Sprinco USA to the highest quality standards available. It is stress relieved for long service life and Moly-Plated for corrosion resistance. These springs last for an incredibly long time and do not lose their strength. Test samples of these springs have been tested for over 100,000 rounds in an M-4 Carbine without a measureable deterioration in power, performance or reliability.
The Enhanced Power spring is designed to provide a bit more spring power than a standard power spring along with improved consistency, long service life and sustained reliability of a high quality spring. Its spring weight falls between the Standard Power Spring and the Extra Power Spring. An Enhanced Power spring is a good choice is you like the way your rifle cycles but you want a bit stronger and higher quality spring that will give you excellent reliability and consistency over a very long service life. Many rifle manufacturers cut corners on the quality of springs they use in their rifles to save money. But some of the manufacturers of the highest quality AR rifles are starting to realize the benefits of using top of the line springs like these. Don't cut corners with cheap springs, get the best and you will be glad you did.