Your AR 15 buffer spring works hard to keep your rifle cycling, but rarely get the credit it deserves. It’s one of the most integral parts of your rifle’s operation. As such, upgrading your rifle with the best buffer spring for you is incredibly important. At Primary Arms, we provide you with a wide variety of buffer springs, from carbine to rifle length. We stock springs from world class manufacturers like, Anderson Manufacturing, Armalite, Geissele, JP Enterprises, Strike Industries and more.