Most kits do come with the full fire control parts and I personally do not worry about it. What is important is that when you do your build that you do not cut your rails as would be required to the full auto parts to work and the extra set of holes for the sear pin are not drilled!
Because of the need for US Compliance parts and the relative inexpensive nature of US made Fire Control parts there is really not a good reason to use those parts anyways so I would just get rid of them once you know you have what you need.
Otherwise, yes, as long as you have your US parts then building from your kit will be fine.
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