Product Description This chrome silicon alloy magazine spring was specially designed by Speedlock to increase the consistency and reliability of AR-15 magazines. Tubb SpeedLock AR-15 Magazine Spring 30-Round Stainless Steel at MidwayUSA Browse all MidwayUSA deals $15.99 In Stock at MidwayUSA Price checked 7 days ago Buy Now at MidwayUSA Secure checkout Easy returns or compare prices Amazon eBay Product Details Brand Tubb Tubb