Apple computers model name identification and getting detailed specs? I'm about to buy a MacBook Pro Customized Model, its model name and number is MD831/LLA.
When I google it, I couldnt find anything from a trusted apple source.
Specifications of the model is as follows;

MacBook Pro 15" Retina, 16 GB Ram, 768 GB SSD, 2.7 Ghz i7

I'm buying it from a local shop which imported the computer from US and itself is not a official Apple distributor or something.

What I'm afraid of is; that what if model turns out to be an older version or something. Because price of the device is considerably low and almost identical to Apple Store.
When I configure a machine as proposed above; price on store.apple.com is ; 3749 $
Local shop sells the same configured computer for 3800 $.

So how can I get detailed information by model name and number proposed by the seller: MD831/LLA
The Apple Specs database isn't always complete -- I think this is the relevant entry, but it doesn't list the model number so it's hard to be sure. I tend to use third-party sources for this sort of thing: I've found EveryMac.com to be reliable, and if you already have a Mac, Mactracker is excellent.

BTW, if you have the computer running with an internet connection, you can get it to look itself up: Pull down the Apple menu, select "About This Mac", then in the info box that opens click "More Info", then in the expanded info window click Support near the top right, then the Specifications link below.