Question concerning OTB of AR15 gas system
Ok, So I've been checking out youtube, and i saw the video of the HK416 vs the Colt, where the colt explodes because water has filled the gas tube:
http://www.youtube.com/watch?v=AGwkHktkTxU
So if this is true, then how is it that SEALs, Marine Recon, and all the other Military units are able to pop out of the water and fire instantly? wouldn't underwater operations fill up the gas tube with water like shown in the video, causing major malfunction to the weapon? or is there some sort of secret in keeping the gas tube water free? or is the whole popping out and instantly shooting all just Hollywood hype?
P.S. Just a new user to the forums searching for knowledge on a subject I'm fuzzy on. And yes, i did a search yet to no avail.
Thanks,
G