The ALG AK recoil spring is a one of a kind design, it is manufactured from chrome silicon steel and resists impact shock and relaxation. The 2 to 3 dead coils in the center change the natural frequency of the spring, which prevents harmonics from damaging the spring and reducing its free length. Features: Chrome silicon steel Resists impact shock Extreme durability #html-body [data-pb-style="62DF828A26232"]{justify-content: flex-start; display: flex; flex-direction: column; background-position: left top; background-size: cover; background-repeat: no-repeat; background-attachment: scroll; border-style: none; border-width: 1px; border-radius: 0px; margin: 0px 0px 10px; padding: 10px;}#html-body [data-pb-style="62DF828A2623F"]{border-style: none; border-width: 1px; border-radius: 0px; margin: 0px; padding: 0px;}