Grid Defense started machining parts in-house in Holly Hill, Florida back in 2014 and has since grown into a 50-machine CNC shop now based in Daytona Beach — mills, lathes, and Swiss machines all running under one roof. They build upper receivers, handguards, and muzzle devices for AR-15, AR-10, AR-9, and AR-47 platforms, plus the pistol-stabilizing hardware and accessories that round out a build.