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Frank, unfortunatey the same with this one. The Biggest AR-15 magazine in 450 Bushmaster is 7 rounds and can't find them in stock. Here's a link to a 5 round magazine. Hope this helps, link here... https://www.budsgunshop.com/product_info.php/products_id/109448/ruger+90679+ar-556+450+bushmaster+5+round+steel+black+finish

Frank, due to its big size and heavy bullet weight, the 450 Bushmaster magazines do not come in high-capacity variants. Additionally, the caliber is more popularly used as a hunting cartridge where high-capacity mags aren't quite viable. A three or five-round mag is ideal for hunting. However, you can also find 7 round mags, in stock here >>> https://www.deltateamtactical.com/asc-450-bushmaster-magazine.html .....Have a great day!