The gas piston is more reliable, and keeps the chamber temps down. It also removes the baked-on carbon deposits you always get in the AR with the direct impingement system. By removing that junk from the moving parts you will cut down on degradation and wear.So if the piston AR is more reliable why isn't it in greater demand?
Finding an HK416 upper is damn near impossible at times. They also are no better than the other gas piston ARs that are put out by various companies.Can you buy an HK416 upper? I know you can't buy the entire gun.
What would be a comparable lower to pair it with?
There are some opinions that this is a solution looking for a problem. Some report the piston upper being more reliable for sustained auto fire and the adjustable gas system to be an advantage when swithcing rounds.So if the piston AR is more reliable why isn't it in greater demand?
Thanks for the replies.