If you’re one of the hojillion people that went out and bought an AR-15 lower in the past two weeks and have no idea how to complete it (it’s OK, everyone has to learn somehow) you really aught to watch this.

It’s also a pretty good guide for assembling a lower without a lot of AR-specific tools, including the wrench trick to get those pins in easily.

We put this guide together a while back, although current prices aren’t going to be that low for a good while now, to say nothing of parts availability.