Product Description The Luth-AR factory replacement .223/5.56 Weld Spring. Fits standard AR-15 rifles. Mfg: Luth-Ar Ar-15 5.56mm Weld Spring at Brownells.com Browse all Brownells.com deals $6.57 In Stock at Brownells.com Buy Now at Brownells.com Secure checkout Easy returns or compare prices Amazon eBay Product Details Category Rifle Barrel Hardware Brand Luth-Ar Luth-Ar