I have bought products from John's Guns for almost 20yrs now.
Never have I known them to be from Plano TX.
Current production is in Coleman TX.
Anyway it should be the newest design since it is a MKIII and should come with a takedown tool that fits a std. 3/8" ratched drive.
you are going to want to clean the baffle stack every 500 rnds or so, if you got 2000 you will most likely never get it apart.