Building Your 416: A Detailed Guide to Uppers and Compatibility HK416A5

In this video, we're taking an in-depth look at the major differences between the generations of 416 uppers, from H&K's classic/modern models to Brownells' interpretations.
HK416A5 / MR223A3 VS H416A1-A3 / MR223A1 / MR556 / BREN4 Upper Receivers