Your just mad cause they did re-invent the wheel, and they did a damn good job!!!
Yes, creating solutions to problems that don't exist is admirable. Welcome to the new america.
Want a piston gun buy a piston gun, (or build it that way- from the ground up!) don't buy a bunch of junk in a can that purports to make your AR a piston gun.
Anyone that tried to sell me an AR with one of those kits in it, I would tell them I wouldn't give them 50 cents for their gun, or I'd take off the upper and tell them we were only discussing the lower because they basically turned the upper into scrap/parts. The whole idea of "converting" a perfectly working rifle is ****ing stupid.
-Mike