So you’re ready to build your own AR-15 upper but aren’t sure of the upper receiver?
We’ve got you covered with our personal go-to mil-spec receiver and also a couple of unique options that will turn heads.
If you haven’t read my AR-15 Guide that goes over all the components of an AR, I’d suggest starting there first. Otherwise, I’ll suppose that you’re well-versed in everything AR and ready to just see what’s the best upper receiver.
*Updated 2018*: More lightweight uppers.
Here’s a sneak peek of our best uppers list if you can’t wait:
I’ve built almost a dozen AR-15 uppers for myself and friends and have almost exclusively gone with Aero Precision. They got their start manufacturing for the aerospace industry (name checks out) and moved into AR-15 parts. Now they are really gunning with complete AR-15’s and even barrels too.
Upper Receiver Forge Marks
You might have heard about forge marks, which are above the forward assist. This just designates which metal forging company created the upper blank. The end company (such as Aero) is the one that actually machines the upper.
So the forge mark by itself means nothing since the quality really comes from the final company (and there are differences). As far as I know, Aero uses several forges but mostly the “broken A” which comes from Anchor Harvey Aluminum.
The gold standard ($80) in my mind that lets you choose your own forward assist and port door. Comes with M4 feedramps, laser engraved T-marks for the rails, and also available in several colors for a little bit more.
I’ve had no problems with any of my builds and if you do any searches you’ll see that it’s almost exclusively positive comments. Remember to finish out your stripped upper with an upper parts kit ($17)
No need to scrape anything when installing…or go nuts on the port door.
3. Blemished Aero Uppers
And if you’re balling on a budget, you can get a “blemished” version (~25% off) of the stripped or assembled upper (depending on their stock). “Blemished” just means there’s some cosmetic abnormalities that will not affect actual function.
The last two builds I’ve done have been with Aero blem uppers and I had to really look to find the cosmetic problem. And of course they’ve all worked fine.
Here’s the latest one…looks like there’s a scuff & a dimple. I put more scuffs on mine during a match! If you want to save a couple bucks I’d go this route.
Bad thing is that they are usually snatched up as soon as they become available.
Probably as light as you can go…and geared towards turning heads at rifle competitions (not home-defense). If you’re in a dusty environment I’d keep it covered…but otherwise initial reports say that the large cuts don’t affect function even with tons of rounds downrange.
I have one on the way for my new competition gun so I’ll report back soon.
Now that you’ve seen our suggestions for the best AR-15 upper receiver (both stripped and assembled), you’re one step closer to your build. Check out the rest of our AR- 15 Guides to continue your parts selection and overall education. And if you’re ready to build…here’s our AR-15 Upper Assembly Visual Guide.