All of those gas piston guns out there….
There are many guns popping up that are now piston driven, everything from Ruger, Adams, POF, and many more. One of the best levels of advice I’ve given to people when they ask about a certain firearm is to not be the first one to buy it because you’ll be the first one that has to send your gun back when they find out there is a design flaw or an upgrade. This happened with the Beretta 92F and we ended up with the Beretta 92FS, and even the LWRC M6A1 had some major internal changes after the gun was first fielded and this is considered the Cadillac of AR15 piston driven guns.
We’ve sold a lot of the LWRC M6A2 guns in the last year or so because they still are the kings of the piston guns. Recently we’ve also sold a lot of the Adams gas piston upper receivers which are different in design but I can’t tell you which is better or if they are worth what they are selling for until they have been fielded and used on the ranges long enough. I’ve seen many minor issues with guns from spring flaws, weak pistons, making the bolt carrier group a one piece and eliminating the screws that keep the gas key in place. These were sheering off on the guns after a few thousand rounds but anyone that purchased these about 2yrs after they came out got the better version.