This instructable will show how to upgrade a Pandora's Box 4S/4X/etc arcade console SuperGun system with better quality Sanwa pushbuttons and joystick. This type of arcade system usually has lot of games built into a metal enclosure with arcade controls. You then plug it into a TV or monitor with HDMI/VGA inputs.
You can view a video of the process on this Youtube video
Youtube Video: https://youtu.be/YS55hpz4vpg?t=6m4s
Pandora's Box 4x 800in1 Arcade Super Gun Gaming Console
http://bit.ly/2wwFwI6
Pandora's Box 4x Full Games List
https://jpst.it/13B5c
12 Piece Original Sanwa OBSF-30 30mm Push Buttons
http://amzn.to/2r4nydz
Sanwa JLF joystick
http://amzn.to/2vdaswL
The stock buttons on most Pandora's Box arcade superguns are 30mm Sanwa clones. You can use Sanwa OSBF-30 or OSBN-30 pushbuttons. OSBF-30 are the snap in type, while OSBN-30 are screw ins. Both will work but OSBF-30 are probably more ideal.
12 Piece Original Sanwa OBSF-30 30mm Push Buttons
http://amzn.to/2r4nydz
The stock arcade stick is also a Sanwa clone but you it can easily be replaced with a real Sanwa JLF-TP-8YT. The stock joystick has a round restrictor plate but square plates are probably more common. There are also octogon gates available separately. Depending on the type of game you play, you can customize it even more.
Sanwa JLF joystick
http://amzn.to/2vdaswL