The product is a specialty cleaning rod guide designed for the AR family of rifles, including AR-15, AR-10/SR25, and HK-91, plus the Ruger 77/22 Hornet.
This AR-15 rod guide is tailored for the 50 caliber, specifically the 50 Beowulf cartridge, and is compatible with AR-15 action fit.
It features a new integral solvent port but does not include an O-Ring with certain product numbers (749-002-900, 749-003-054, or 749-002-899).