We make specialty rod guides for the AR family of rifles (AR-15, AR-10/SR25, and HK-91) and the Ruger 77/22 Hornet. The AR family rod guides are the O-ring style, while the Ruger 77/22 Hornet is one of our rimfire type rod guides. Includes new intergral solvent port. O-Ring not included with 749-002-900, 749-003-054 or 749-002-899. Mfg: Sinclair International