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This UPC code references "With the BOSS" Chris. I would still contact Buds for confirmation via LiveChat (available from 9AM to 9PM 7 days a week), the "Blue Chat Now" bottom at the bottom right of the page at 9 CST this morning, or phoning at (859) 368-0371 (available 9AM to 9PM EST Monday through Friday).
this one the A504 is for use without the Boss "Doublestar Ace Folding Stock Mechanism With Integrated AR-15 Stock Interface Without Boss Black A504"
you will need to Contact Buds at 1-859-368-0371 9am-9pm EST Mon-Fri. or use the Blue Chat now button because either the PN or the upc is incorrect on the doublestar page the A504 is for without Boss and the A504-K is for with Boss https://star15.com/catalogsearch/result/?q=a504