Schecter Omen Extreme-7: This guitar features a mahogany body with a quilted maple top, a bolt-on maple neck with an ebony fingerboard, and Duncan Designed HB-105 humbucking pickups. It also comes with a Floyd Rose Special tremolo system.
Ibanez RG7421: This guitar has a mahogany body with a quilted maple top, a Wizard III maple neck with a jatoba fingerboard, and Quantum pickups. It also features an Edge Zero II tremolo system.
Jackson JS Series Dinky Arch Top JS22-7: This guitar has a poplar body with a quilt maple top, a bolt-on maple neck with a jatoba fingerboard, and Seymour Duncan Designed humbucking pickups. It also comes with a Floyd Rose Special tremolo system.
ESP LTD M-7HT Black Metal Electric Guitar: This guitar features a mahogany body with a quilted maple top, a mahogany neck with an ebony fingerboard, and EMG 81-7 and 85-7 humbucking pickups. It also comes with a Floyd Rose Original tremolo system.
Dean Vendetta 7 String: This guitar features a solid mahogany body and neck, a rosewood fingerboard, and Seymour Duncan Designed humbucking pickups. It also comes with a Floyd Rose Special tremolo system.
These are just a few examples of 7-string metal guitars with a Floyd Rose tremolo system that can be found in the $400 price range. It's important to consider factors such as the wood used, the pickups, and the overall build quality when choosing the right guitar for your needs.