If you are in hot/humid south Florida, you may want to check into www.POF-USA.com
They sell a few rifles, uppers/lowers, parts, merch, etc.
Some M4 & AR products are for sworn LE or active duty military ONLY.
The firm also uses a few M4s with Robar's great NP3.
If you are a sworn LEO and have the $$$, this company may have a great patrol or spec ops platform for you.