Guaranteed you will not have the full MWS experience if you buy a gun with that many mods.
Get a stock one, get trades lasered or machined in if you want them, and as @AlphaBear said, just swap out externals if you want.
Do not change from the stock recievers, buffer tube or 90% of the internals.
Rails, stocks, hand guards, selectors, sights - eat your heart out.