Aero Precision M4E1 Stripped AR-15 Lower Receiver - Black
The Aero Precision M4E1 Stripped AR-15 Lower Receiver is a fantastic foundation for a new AR-15 build. This lower receiver is machined from 7075-T6 forged aluminum and has an enhanced forging to deliver billet aesthetics in a forged package. Anodized black, it is compatible with all Mil-Spec AR-15 parts, including standard AR-15 components and magazines.
With a threaded bolt catch roll pin, the installation of the bolt catch is simpler, and it virtually eliminates the possibility of damage to the receiver finish during installation. The pin is included, and a 1/16" Hex Key is required for assembly. An integrated trigger guard eliminates the possibility of breaking the trigger guard tabs, and the rear takedown pin detent hole is threaded for a 4-40 set screw for easy installation of the takedown pin detent and spring.
Additionally, the Aero Precision M4E1 Stripped AR-15 Lower Receiver has an upper tension screw inserted in the grip tang of the lower receiver, which provides a fine tune adjustment for the fit of the upper and lower receiver. It also has a nylon-tipped tensioning set screw and an increased magwell flare that aids in quick and efficient magazine changes. This lower receiver is marked and milled to accept short-throw safety selectors, but it will work with standard selectors as well.
- Compatible with standard AR-15 components and magazines
- Nylon tipped tensioning set screw
- Threaded bolt catch roll pin (included)
- Machined from 7075-T6 forged aluminum
- Anodized black
- Rear takedown pin detent hole is threaded for a 4-40 set screw
- Weight: 8.61 oz
California Prop 65 warning
WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.
Ratings & Reviews
by Anonymous -
WOW!! Aero knocked this one out of the park. The billet look for the forged lower price. This lower looks incredible and will be purchasing aero products again in the future.
Deluxe lower for $100 or less
by Colorado shooter
This new M4E1 lower is the best you can get in a forged lower. I will build my next two rifles (Valkyrie and Faxon 3 gun) with this lower. Every hole was perfect, beautiful finish on the smooth casting and nice trigger guard. I used a matching M4E1 upper om my Grendel build. Perfect line up. Looks billet with smooth edges.
My Go-To Lower
Absolutely flawless fit and finish. Mates perfectly with an Aero M4E1 upper, producing a rifle that functions with buttery smoothness, and looks great doing it. As a bonus, p-mags drop free with only a push of the mag release button.
My go-to lower receiver
This is an excellent lower receiver. The threaded bolt catch roll pin has ruined me on lower receivers; I can never buy a different brand or model now! Fit my M4 upper receiver and Atlas S-One perfectly. Runs like a dream. Cannot recommend this item enough.
by Walt -
Flawless finish. Used this lower on an 11" AR pistol in 7.62x39 married to an Aero Precision upper receiver for flawless performance. The threaded set screw for the bolt catch lever and the rear take-down pin channel threaded for a 4-40 set screw (buy a pack of 8 for under $5 and use just enough torque), make those installs super easy (no more risk of a flying take-down spring). The integrated skeletal trigger guard is shooting glove friendly and eliminates the cost for an over-sized aftermarket trigger guard; plus, it looks cool. This is an incredible deal.
My go to for maximum lower builds.
by William -
Built my first AR with one of these. Not long after did I realize I should ONLY be shopping for these bad boys. After a few ponies I see how I've been spoiled by Aero. Hands down, this is now my go to for builds.
You won't be sorry
by Buddha6 -
The usual with Aero Precision is "flawless" and this one met that standard. What made this purchase exceptional was that it was ordered Monday night and was received on Friday morning.
This build is for a new 3 Gun AR and the Aero Lower is a great start! Kudos to PA!
by Rho Rho -
Beautiful piece! This defines perfection. My 1st ever lower from aero and I don't think I'll use another brand going forward.
Aero Precision knocks it out of the park!
I just finished my first AR build using this Aero M4E1 lower (and matched upper) and the quality is second to none!!! The use of threaded pins is far better than any of the competition at this price point. Factor in the excellent pricing by Primary Arms and this is a no brainer!!! This lower gives the impression of a billet lower. Fit and finish is flawless. The trigger guard is glove friendly and it looks way cool! Assembly using Aero lower and upper parts kits was a breeze although I figure other parts kits would be no different. The lower and corresponding Aero upper mate together with no slop. If I build another AR, I will use these same quality Aero Precision components and will get them through Primary Arms!
Great stripped lower
by Patrick -
One of the features that drew me to this lower is the ability to get the upper snug on the lower. When I tightened the screw to get it snug enough to get rid of any wiggle, you can no longer actuate the rear takedown pin. Also, you have to remove the pistol grip to adjust that feature and the screw turns really easy. I think if you run it hard enough it might come loose unless you put some lock tight on it. It is still a good lower for the price.