Reviews & Ratings for Aero Precision M4E1 Threaded Assembled Upper Receiver — 80 reviews — Page 1

The Aero Precision M4E1 has a perfect tight fit with Aero Precision lower. This is a forge upper with a billet look. I highly recommend this upper.

I always build my ARs with Aero Precision components. This upper receiver is well built and dependable.

Love the sniper grey look. This is my 2nd upper id purchased

Excellent product! Very premium look! Totally recommend but try to get a receiver set so the color would match with your lower.

Quick and fast shipping,Great upper, nice and tight lockup with Aero lower.

TLDR: Aero makes a great upper for a great price. Perfect for Aero builds or beginners. Will definitely buy and use again.

I bought two Aero Precision M4E1 Threaded Assembled Upper Receivers for two new builds. They are great upper receivers for the price especially when on sale. Having them come pre-assembled is a plus and speeds up the build process a bit. I wish the tolerances were a bit tighter but they are definitely in spec. BCM, Zev, Radian and Noveske spoiled me a bit as I am use to heating up the threads to get the barrel in but for a budget builds or if you are a first time builder this may be a plus. I built a 10.5" and 11.5" aero uppers for a M4E1 lower. Both uppers came out great. Wasn't sure what barrel length to go with so I did both. This was my first time making pistol builds and I have the frame of mind that you should always start with aero and move up from there when building rifles. Aero makes great parts for a great price and I would never go lower in quality when it comes to building my own rifle. I am now thinking of building a 11.5" Geissele next since these turned out great. I prefer the 11.5" over the 10.5". If you need a good upper for a good price then don't hesitate to buy this one. I know it won't be my last time buying one.

I bought the Aero Precision M4E1 Threaded Assembled Upper Receiver for a new Aero Precision M4E1 Build. It's a great upper receiver at a really good price especially on sale. Can't go wrong with Aero Precision parts. I've used them many times before and will certainly use them again in the future. I can definitely recommend this assembled upper receiver.

FYI - a few shades lighter than the new pro odg anodized rail.

well made, nice finish, no complaints. would purchase again

First time buying an upper and after hearing so much about Aeros quality and with great pricing on OP, I landed on this beauty. The quality and build was great from my first impressions. I did have a slight issue with the upper not receiving the gas tube. It wouldn’t go in. One slipped by Aero in QC check. No worries. Optics Planet had my back. No hassle return/exchange. The new replacement came in and I had no issue with that one. Overall, I had a great experience, great deal and quality product, (once the one was replaced).

I would recommend OP.com and Aero parts hands down to all my friends and family.