What tool do you value as most important in AR disassembly?

Have witnessed some people really banging up stuff working on rifles especially when taking them apart. What tool do you name the best helper to prevent damage?
Update: If you have more than 1 favorite please name them and put them in order.
Update 2: punches have been named and there is one punch in particular that comes to mind. hint-it is used to drive out spring pin in mag release.
Update 3: Excuse me, I really meant to say bolt catch instead of magazine release.
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