Personally, I'm not a fan of over-gassed uppers so, I generally stay away from Daniel Defense though they are generally a really good manufacturer for people not running suppressed. As noted, running non-standard or proprietary systems can also be an issue if you don't travel with a decent set of spare parts. Murphy's law can strike even a premium built rifle.
For people randomly asking about AR-15's, mixing and matching uppers and lowers is a no-go for me though, it is better than "franken'gun" recommendations from random "gun plumbers". YMMV
A complete rifle is better for someone new to the rifle game as well for multiple reasons. While you can save F.E.T. by purchasing a quality complete lower from someone and a similar quality upper from someone else, you still have to pay shipping and where do you go if things aren't right? Personally, I'll give the extra ~$100 to a quality manufacturer to have a completely debugged system that is ready to go to work.
This doesn't mean that your $30 gun show lower with a random LPK and a good upper won't meet the needs of many people though.
Having wasted a lot of money on various AR-15 uppers and lowers over the years, I could have easily afforded the KAC a long time ago. Today, those other rifles, uppers, etc. are collecting dust because the KAC is simply a vastly superior rifle in my hands with my trigger finger. A retired Marine could probably still outshoot me with their rack grade random AR-15 but, the fact remains I hit stuff with KAC that would be a miss with my other AR-15's.
And no, KAC isn't the only manufacturer with these qualities, just the one I have personal experience with.
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