Here is part 2 of the Brain Exploder's review of the GBLS DAS M4A1 AEG which has the most realistic functions for an M4 AEG... "Now that the gun is assembled it's time to show you how it function what I think about it measure some baseline abilities like FPS, RPS and short range accuracy, I also go over some of the issues I have had and fixes to remedy them.

See part 1 of the review: https://www.youtube.com/watch?v=aIoiR."