About 5000 minimum to get rolling. That’s on a GOOD deal. More like 7500.00 for a M/11 or likewise. Get up into M-16s you’re around 20,000.00 +\-What type of Money is involved in the FA game ? I have no clue.
Best way to get started is with a Mac, 2 Stamp it with a 2 stage suppressor and pop for a LAGE upper and buttstock it’s nastyyyyyy. A lot of fun