I think one of the problems you run into with “hobby level” ARs versus “top tier” ARs is the definition of “hard use.”
Is Stag just as good as a Colt for going out and blasting Mountain Dew bottles and dirt clods a couple of times a year, probably never seeing any more than a couple of thousand rounds at most down the barrel in the lifetime?
I would say yes, for that specific application a Stag is “just as good as” a Colt. Depending on price point, maybe even a better deal.
On the flip side, is a Windham carbine going to be my first choice for a go-to rifle if TSHTF, zombie apocalypse, combat or end of the world scenario that I bet my life on to run with little to no problems?
Not at all.
In some regards, and for I would say the majority of the AR owners out there, a Stag, DPMS, Windham, etc will end up doing them fine for the amount of rounds they will put down the barrel in their lifetime. But for those that are looking at a hard use weapon that is reliable out of the box with high round counts, then not necessarily. But this is where many will say “I have shot thousands of rounds through my DPMS without a flaw!” But…not all the DPMS are going to run great and there is a more likely chance of getting a lemon from the factory than say a BCM or a Noveske.
Using a car relation, which I’m not fond of, but have nothing else to compare it to, some cars are built and will be able to run for a million miles. Not sure how, but that particular Ford Ranger just keeps running. You can change out the oil twice in 300,000 miles and do little more than add washer fluid and it still runs somehow. Maybe it was made on a Tuesday and all the factory workers were in tune and the steel and alloys were the right mix for it to perform at peak levels. Maybe someone didn’t cut corners. It just happens sometimes. Does that mean all Ford Rangers will run for a million miles? No, but there are some that just were put together the right way and run with few problems throughout their lifetime.
Liken that to a Bushmaster that folks claim to have shot twenty thousand rounds through. Sure, they probably have. Maybe that rifle was made on the Tuesday and the barrel steel was the perfect mix, the bolt was one of the batch that got the MPI and everything was utterly perfect as it left the factory floor. Chances are you cannot break it. So it runs perfectly while the one that followed it on the assembly line fails within a thousand rounds.
Chance is the name of the game when building hobby grade ARs.
The major difference in top tier ARs is the fact there few things left to chance. Full testing and the proper materials used in the construction according to the TDP in Colt’s case or as close as they can get in the other top tier AR manufacturers. You aren’t going to get that with lower level ARs that cut corners and leave things to chance. Batch testing done on bolts and barrels are leaving a lot of things to chance. They test one out of a hundred (arbitrary number as I honestly have no clue what the actual number is) and the number ten through eighty-eight have cracks in the lugs. But the batch testing doesn’t pick up on that. And chances are owners are never going to shoot that rifle to failure anyway so it’s a moot point, but they will point to the lack of failure as being “equal.”
So when it comes down to choosing a “hobby grade” AR versus a “top tier” AR, I’d rather leave as little to chance as possible. Is a Stag just as good as a Colt? Sometimes. Does it leave a lot to chance in potential failure points? Absolutely.
May not be the exact info you are looking for, but just the way I see it.