Dolos Standard Lock Collar

The Dolos Lock collar provides the ability to add additional barrels to your Dolos equipped AR15. This unit is compatible with many Anderson Manufacturing, Rock River Arms, Unique ARs, and YHM (and may work with handguards from other manufacturers, as well as Pantheon Arms handguards). Our support page has a complete list of compatible handguards.
 
Threaded 1.850"-30TPI.