Apparently he changed his original idea. Remember though, he bought that dumbass stock with the retractable sling and got stuck on the gas block replacement?
Then after going to that shooting range with the head of the Puget Sound SRA, there's now another stock, and what looks like a new gasblock. No one as retarded as Zeno could have half assed that, so he's obviously been getting help by someone knowledgeable.
That's the danger with troons like Zeno getting a gun. There's a lot of far left people willing to train a true believer like him, and to also pump him up with scary stories to make a very good, fat little stormtrooper.