Lol yes I'm one of those guys..I'm a arsenal fan my self ....but DDI is good stuff I was rather impressed by there workFwiw, according to owners on the akfiles the DDI rifles are g2g. And those guys will freak out over a single light primer strike.
I would stick to a stamped receiver if you want to do anything with the stock. That said I love my sam7r and would much rather drop a extra couple of bills and go arsenal rather that'll ddi/waffen werks. If you go stamped there will be a lot more options available to you without messing with the tangs