If you are going to be an AR Armorer, you need extra 1/16" punches.
I like the roll pin punches and the mini punches from Brownells.
Also their replaceable pin punch where you can have just a little stub sticking out.
Removing the ejector retaining pin is half energy delivered to the pin with a proper punch, and half supporting the bolt from the underside with an armorer's bench block. I like the nylon ones, also from Brownells.
Once you get a new assortment of different 1/16" punches,try driving out the pin from the otherside, unless you already have moved it a little from you original attack position.
The plunger depressing gizmos are good for re-installation, but should not be necessary for removal. Just cover the front of the bolt when you withdraw the punch so you can catch the plunger because it is really spring loaded.
I like the Sinclair modle plunger depressor the best because I like the way you can clamp in a machinst vice.
Always use a new roll pin when you re-install if you can. Plan ahead, also have a spare plunger and spring in case they "spring lost" on you.
Same is true for like when you remove the buttstock--have spares of these little spring loaded parts before dissaembly.
Good luck.