re: If you want to own an AR-15, you should build it

You can see the tools you need if you print out the link of instructions from ar15.com

You need needle nose pliers. You should get a brass hammer. You need masking tape unless you want to scratch the hell out of your receiver.

I didn't use a block or grip. As far as the bolt lock pin goes, read the instructions on the print out on how to do it rather than what the video says.

Using the correct sized hole punch to keep everything in position when you hammer in the pins is key. This would have been a nightmare if not for that hint. It works especially well for the bolt lock pin but also for the trigger pins and hammer pins.