I have two complete colt guns and a complete lower. They are good guns for sure. I got them on good deals.
Other guns that I consider excellent quality are BCM, LMT and Daniel Defense. Though I believe that DD guns are overpriced. My first AR was a DD and while it was an excellent gun, they have gotten quite pricey.
As mentioned above, it depends what you want the gun for. Defense, plinking, just because you want one. The reason I mention that is that there are so many options and if one is just starting out, they might not know what they want or need. I can say that was true for me. There was a laundry list of things that I wanted to add or change. After shooting for a while, some of those things changed. That said, I am the type that wants to try for myself. Light weight be normal weight barrels, Aimpoint vs EoTech, FSP vs flip up sights, etc. I ended up buying multiple guns in different configurations to try. While fun and I learned a lot, it was expensive. I have a box of stuff that went on the gun and eventually came off. Some were even bought that never ended up on the gun.
Anyways, since it seems like you budget conscious, I could recommend buying something basic and shooting it lots. If you have buddies with ARs, even better and you can try theirs.
Build vs complete. My personal preference is to buy complete if defensive use will be primary and you aren't experienced in building ARs. I've built guns and while they have done fine, at least so far. I've seen to many user "custom" builds shit the bed. That and in my experience, you build to get exactly what you want and aren't generally going to save money, or at least not a significant amount.
Good luck and enjoy the world of ARs. You're lucky that you're getting into it while the market is quite good for ARs.
Finish? That's one aspect that isn't very important to me. Yeah, I don't want a new guns to have a beat to shit look before I shoot them. That said, all my guns are shooters, whether at the range, competition, training, etc. They each develop their own personality. If you're worried about finish, guns like Noveske tend to have really high quality finish, but you're definitely going to pay a premium.
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