Ian and Karl from the In-Range TV crew take an AR and get good and muddy with it to see just where the failure point is.
And yes, as it’s a mud test and not for accuracy, they don’t run it with sights.
You will be surprised how far they get once the mud starts chunking.
And Karl’s repro WWII German tan and water camouflage smock is a nice touch.
Source Article from http://www.guns.com/2016/01/07/ar-platforms-wont-work-in-the-mud-right-video/