Product Description The Stern Defense .45 ACP barrel is a durable, performance-focused option for AR-style pistol-caliber builds. Manufactured from 4150 chrome moly steel and treated with a black Melonite finish, it is designed to provide excellent wear resistance and long service life. With a 16.10-inch length, 1:16 twist rate, and .578x28 muzzle threads, this barrel is well-suited for reliable .45 ACP function and common muzzle device compatibility. Product Highlights 16.10-inch .45 ACP barrel for AR-style pistol-caliber builds 4150 chrome moly steel construction for strength and durability Black Melonite finish for enhanced corrosion and wear resistance 1:16 twist rate for dependable .45 ACP stabilization .578x28 thread pattern supports many common .45 ACP muzzle devices Specs Brand: Stern Defense Manufacturer Part Number: 00645ACPBARREL161INCHD UPC: 850001176354 Caliber: .45 ACP Barrel Length: 16.10 in Material: 4150 Chrome Moly Steel Finish: Black Melonite Twist Rate: 1:16 Thread Pattern: .578x28 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.