The Aero Precision M4E1 Stripped Lower Receiver was developed to meet the needs of precision shooters, builders, and enthusiasts who want more from their rifle’s foundation. While it retains the compatibility and reliability of mil-spec AR-15 lowers, it brings unique design enhancements that streamline assembly, improve functionality, and boost visual appeal.
Built from 7075-T6 forged aluminum, the M4E1 lower is exceptionally strong and durable—matching or exceeding military standards while offering greater consistency and tighter tolerances than many standard forged lowers. It’s finished with a Type III Class 2 hardcoat anodizing in black, giving it a sleek appearance and outstanding resistance to corrosion and surface wear.
What sets the M4E1 apart from traditional lowers is its billet-style design. It blends the sleek, angular aesthetics of billet receivers with the strength and value of forged construction. From the front of the magwell to the rear takedown lug, every angle and surface has been thoughtfully engineered to look great and perform even better.
Key structural enhancements start with the integrated trigger guard, which eliminates the need for a roll pin and removes one of the most commonly broken areas on AR-15 lowers. This built-in feature adds strength and provides additional clearance for gloves—especially helpful for cold-weather shooters and tactical users.
Another smart upgrade is the threaded bolt catch roll pin, which makes the bolt catch installation process easier and reduces the chance of damaging your receiver’s finish. Instead of using a punch and hammer, you simply install the bolt catch using a 1/16″ hex screw (included).
The M4E1 also includes a threaded rear takedown pin detent recess, allowing builders to secure the detent with a 4-40 set screw instead of struggling with springs under pressure. This not only simplifies the build process, but it also makes future disassembly cleaner and safer.
For a snug fit between upper and lower receivers, Aero includes a nylon-tipped upper tensioning screw pre-installed in the grip tang. This allows you to eliminate any slop or play that may exist between the receivers, creating a rock-solid fit that enhances accuracy and handling feel.
The magwell on the M4E1 is flared more aggressively than mil-spec lowers, improving reload speed and giving you a larger opening to guide magazines during fast-paced manipulations. This extra flair proves especially valuable in competition, defensive, or tactical settings where speed counts.
Key Features:
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Forged 7075-T6 Aluminum Construction – Precision-machined for high strength and consistent fitment
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Type III Class 2 Hardcoat Anodized Finish – Matte black surface provides wear and corrosion resistance
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Integrated Trigger Guard – Built into the receiver for strength and increased clearance
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Threaded Bolt Catch Roll Pin – Easier to install and safer for your finish
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Threaded Rear Takedown Detent Channel – Allows secure installation with a set screw
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Upper Tension Screw – Eliminates slop between upper and lower receivers
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Enhanced Flared Magwell – Makes magazine reloads faster and smoother
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Billet-Style Design – Bold, contoured appearance in a forged package
Specifications:
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Model Number: APAR600001C
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Material: 7075-T6 Forged Aluminum
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Finish: Black Anodized
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Weight: Approx. 8.61 oz
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Caliber Marking: Multi-Cal
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Trigger Guard: Integrated
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Compatibility: Standard AR-15 components and magazines
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Safety Selector Compatibility: Short-throw and standard selector compatible
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Included Hardware: Threaded bolt catch screw, upper tension screw, takedown detent set screw
Applications:
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Precision AR-15 Builds – Designed to support tight tolerances and secure fit for accuracy-focused builds
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Tactical and Duty Rifles – Strengthened areas and practical enhancements ideal for hard-use rifles
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Cold Weather or Gloved Shooting – Integrated trigger guard allows space for gloves without compromising control
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Home Builders and Gunsmiths – Threaded pins and simplified parts make it easy for builders of any skill level
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Competition Use – Flared magwell and tight lock-up features benefit speed and consistency on the clock
Installation Note:
The M4E1 stripped lower receiver is ready for assembly with any standard AR-15 lower parts kit, buffer assembly, and stock. While the enhanced features simplify build steps, always follow best practices during assembly or consult with a qualified armorer.
Summary:
The Aero Precision M4E1 Stripped Lower Receiver is more than just the foundation of your next rifle—it’s an upgrade in every sense. With billet-inspired aesthetics, enhanced install-friendly features, and precise machining, it delivers exceptional performance and dependability for any shooter who demands more from their gear. Whether you’re a first-time builder or a seasoned AR enthusiast, this lower brings strength, functionality, and clean lines together in one reliable package.
Brought to you by Black Bayou Armory
