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Yes this barrel fits all mil spec AR-15 uppers

Hi Craig and welcome. Yes, this barrel has a Gas Block Seat: .750" Diameter by .920" Length - Dimpled for Set Screw Gas System: Rifle-Length. Since it has a rifle length gas system, you would need to replace your current handguard and gas tube on your Delton Sierra 360 Rifle. Cheers, stay safe and enjoy!

Yes, this barrel will fit and function properly in any milspec AR15 upper.