Went to Walmart to buy the DPMS they have for $587 but after looking it over decided to ask your opinions. It has a basic lower reciever. It does not have a dust cover, a forward assist or the triangle piece just to the rear of the ejection port. How important are these things? Is it worth buying and then looking for a stripped lower to replace it with? To me a dust cover is not important and I've never used a forward assist but if that triangle protrusion keeps brass from leaving marks on my forehead it might be a deal breaker. What say you?