Quote History Quoted:
Just bit over $1k
Upper: $891
https://www.larue.com/products/larue-ultimate-ar-15-upper-kit/
Lower: $199
https://www.larue.com/products/larue-billet-lowers/
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Maybe not the best bet for a first AR, since the UU kits are running a 3-6 months lead time. I just got mine after 3 months, and it's an awesome kit for the money, but I had other ARs to fill the gap while waiting.
OP, assembling a lower is easy if you have any basic tool skills, and only requires a few special punches and such. Assembling an upper is a lot trickier and requires more tools.
All my ARs were home-built lowers and pre-assembled uppers. I'm getting into things like barrel swaps now and FF handguards now - buying the tools and building the experience - but I've been a tool user my whole life. Even so, I've managed to break a few things.
Also, buying used can be tricky, as you're sometimes getting other people's problems. I've had that happen multiple times on a variety of guns. Good for building experience, not so great for a first AR.
My recommendation is to either buy a new rifle from someone reputable who will support any problems, or buy a new upper and build a lower if you're comfortable with that. If your budget allows, go ahead and put a LaRue UU on order, as few people stop at one AR.