Product Description Upgrade your full-size 1911 with the Wilson Combat 33D Drop-In Match Grade Barrel, precision-machined from aircraft-grade stainless steel forgings for outstanding accuracy and long service life. Each barrel is heat-treated to Rockwell C 40 and manufactured with critical tolerances held to less than 0.0005 inch. Designed for a strong, consistent lock-up in most Colt and Springfield Armory pistols, this 5-inch .45 ACP barrel features a glass-smooth chamber and concentric bore to help deliver match-grade performance. Product Highlights Drop-in 5-inch match-grade barrel for full-size Government-style 1911 pistols Aircraft-grade stainless steel forging with heat treatment to Rockwell C 40 for durability Critical tolerances held to less than 0.0005 inch for consistent fit and performance Glass-smooth chamber and concentric bore design to support excellent accuracy Includes barrel bushing for convenient installation Specs Brand: Wilson Combat Manufacturer Part Number: 33D UPC: 874218001100 Type: 1911 handgun barrel (drop-in, match grade) Caliber: .45 ACP Barrel Length: 5 in Material: Stainless steel (aircraft grade; 416 stainless referenced) Twist Rate: 1:16 Heat Treat: Rockwell C 40 Included: Barrel bushing Fit: Most full-size Government-style 1911 pistols (noted for many Colt and Springfield Armory pistols) Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the product&';s manufacturer.