Cisco Adaptive Security Appliance ASA 5510 firewall
Not as fancy as the Cisco ASA 5520. Looks like the main difference is they didn't fully populate the board. Otherwise mostly the same parts.
Cisco ASA 5520 teardown:
• Cisco Adaptive Security Appliance ASA 5520...
Parts for these firewalls if they are still in stock:
https://www.ebay.com/sch/i.html?_from...