I'm a PWS piston conversion dealer. I can tell you not all government agencies get to throw away money and some are looking at running our system in their guns rather than replaceing them.
I have to go to the range to do a government demo this Friday.
I work in several aspects of Government Fed, State, and local.......THEY ALL THROW MONEY AWAY!
What government needs a gas piston conversion other than MILITARY. These guys (FBI, DEA, State Local ETC) really do not put all that ammo downrange in a combat situation to really justify the conversion. While gas pistons are great, what is wrong with the M4 when the most ammo you put downrange is at a class or practice. All you have to do is keep one clean!
Although 416's rock!
Mags from HK are great, but too heavy to carry in a combat load. Rather carry the old alum ones and save some weight!