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I would check on large gun and accessory sites like (6)un (8)roker as discontinued and hard to find firearms and accessories show up for sale by private individuals and small shops. Just replace (6) & (8) with G & B.
Buds is trying I am sure. Check gun shops, pawn shops, and as many websites as you have time for. Keep looking daily.
check with the major auction sites like G(un)B(broker) and G(uns)A(merica) Remove ()
Good Luck. Pre owned or secondary market would be your best bet.
https://www.scopelist.com/Springfield-Armory-556-75-Saint-Victor-Pistol-w-Stainless-Steel-Barrel-SBA3-Brac.aspx
https://www.foothillsjewelryandloan.com/in-store-rifles/semi-automatic-27-1434/springfield-armory-saint-ar-15-556mm-16-301-new-3188040