They demonstrated the HK 416 on the Superweapons prog on Discovery channel.
The Presenter said to be an ex SEAL, buried the HK 416 in fine sand, then picked up the weapon and giving a quick shake as he lifted it into shoulder proceeded to fire a full magazine 20 ?, rounds in three full auto bursts.
He then repeated the test after submerging in working parts in water. A quick shake on way to shoulder, once again being only 'Cleaning'.
After firing off a full mag on full auto the Bolt was removed and could be held in the bare hand.
I am no expert but it seemed a Honest Test and Report, perhaps more expireanced troops would care to comment.
Colt is already developing their own AR-15 gas-piston operating system and rumors are circulating that HK416 upper recievers are being shipped to the frontlines. Surely can't be long before something gets done?