BudsGunShop.com - IS this for 300 Blackout

Yes 300 AAC is 300 Blackout.
"The .300 AAC Blackout (designated as the 300 BLK by the SAAMI and 300 AAC Blackout by the C.I.P. ), also known as 7.62×35mm is an intermediate cartridge developed in the United States by Advanced Armament Corporation (AAC) for use in the M4 carbine."

yes it is

Gordon, yes Sir it is. Cheers and stay safe! Fiocchi Ammo .300 AAC Blackout 150 Grain Full Metal Jacket Boat Tail 1925 fps