Includes #40 Rear Flip-Up Sight
The A.R.M.S. #38 STD SWAN Sleeve offers the same length as the receiver and has a #40 rear built in flip-up sight. This sleeve is 5.56 cal and provides a platform that is semi-permanent to the 5.56 cal M16 equipped with a flat top receiver. Includes side tension screws and black, non-reflective finish.
Specs: 5.56 cal, For M16 with flat top receiver, Black finish, Includes #40 rear flip-up sight