Daniel Defense MK18 RIS II Rail System
Current production Colt upper receiver group with DD RIS II barrel nut.
(Correctly installed using the SA wrench pictured)
(Correctly installed using the SA wrench pictured)
Note: The entire front sight base has been intricately machined to fit inside the DD rail dimensions.
Colt factory gas system - No aftermarket gas-blocks or set-screws.
(Shop Service - DD RIS II Gas Block)
Colt factory gas system - No aftermarket gas-blocks or set-screws.
(Shop Service - DD RIS II Gas Block)
Colt upper receiver group completed and ready to fire