Knights Armament URX 4 Teaser Video

[John Hwang]

http://www.youtube.com/watch?v=FKU1uqcvACw

[clark213]

I wonder if these are going to be sold on their rifles moving forward or if they will just be offered as an "after market" piece?

[restfortheweary]

Operation parts lists these as currently available for 5.56 but out of stock. Can anyone confirm release?