Talley Manufacturing's Winchester Xpert Picatinny Rails are machined entirely from high grade 7000 series alloy and protected with a hard-coat anodizing to 65 Rockwell ensuring the craftsmanship of these Picatinny Rails last the lifetime of your firearm. The Winchester Xpert Picatinny Rails are all designed and manufactured with precision to fit your firearm with the industry's tightest manufacturing tolerances.