If that's the model you have your heart set on if not let a custom cerakote job keep you from it, you can always buy a standard version and get it Cerakoted for less the $100 (id recommend Primary Machine, but there are lots of cerakoters out there).
SAO version in stock here
https://gun.deals/search/apachesolr_search/220r5-10-legion-sao
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DA/SA Legion version here.
https://gun.deals/search/apachesolr_search/220r5-10-legion

Ken, Just checked there website and guarantee they're fake. They require you to pay with zelle, or Bitcoin, you can't pay with debit/credit card Wich is a huge red flag. Do not buy from them you will get ripped off. You can check for yourself by Googling (sig saur armory legit ) several posts confirm its a fake website. Unfortunately since demand for firearms is so high alot of fake websites have emerged. alot of times if they're the only place who has a hard to find firearm in stock, or require you to pay with PayPal, Bitcoin, zelle, money order and not credit/debit card they're not legit. Your best option to find one is by checking a website called gunbr0ker. They're a site that allows private owners and small shops to sell their products so they usually have rare and hard to find firearms and accessories. Sorry but hope this helps.

Kenneth, I have not used them for anything but, I would contact Sig Sauer directly to inquire as to SIG Armory legitimacy at 603-610-3000 option 1 Monday-Friday, 8:30am-5:00pm EST.