Ask Foghorn: How To Build an AR-15 Upper Receiver

By Nick Leghorn

Daniel writes:

I was reading his post on assembling an AR lower assembly. It was awesome and the associated video answered all my questions and was done very well. All fan boy aside, I was wondering if he could do one for putting together an upper.

I’ve been avoiding doing this one since putting together an upper receiver is a bit of a pain in the butt. It requires some tools which I don’t have readily available (and probably wouldn’t work in my apartment), but thankfully Tyler Kee offered to give me a hand and show me how it’s done over some beers in his garage.

Step 1: Forward Assist

Some upper receivers don’t come with a forward assist, but for those that do you’ll need to pop it in place. The whole assembly is held in place by a roll pin, and relatively speaking this is the easiest part of the whole process.

Configure the forward assist as shown. The flat side of the forward assist should be positioned towards the outside, while the somewhat curved section should be on the inside. You’ll notice that there’s a recessed section cut out of the forward assist (on the side facing the bolt …Read the Rest

Source:: Truth About Guns