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AERO PRECISION M4E1 STRIPPED LOWER RECEIVERS FOR AR-15

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Made In The U.S.A.

Products marked with the Stars and Stripes are proudly made in the U.S.A.

Many customers have asked us to show which products are made in America, and we’ve begun working with our vendors to identify them. This information, however, is not available for all items nor does it imply that foreign merchandise is of lesser quality. We will continue to gather this information to assist our customers in making informed buying decisions, and will keep our website current with the latest information.

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We make purchasing and returning products as simple as possible. If you buy a product from Brownells and decide you don’t need it, don’t want it, or just don’t like it, we’ll take it back any time… with a few exceptions

Exceptions include: 

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  • Modified 80% frames & receivers 
  • Gun powder
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  • Limited Quantity/Hazardous items
  • Products that are subject to pending or implemented restrictions due to Federal, State, or Local regulation/legislation

All other products are Guaranteed. Forever.® you can easily identify these products by the Guaranteed. Forever.® Icon.

Guaranteed. Forever.

Guaranteed. Forever.® return policy applies to the product’s original owner along with proof of purchase. Any items returned within 45 days of shipment are entitled to a refund. Any items returned after 45 days of shipment will be issued store credit in the form of a Brownells Gift Card. If a Brownells/Sinclair product was purchased through another retailer as a new product we will require proof of purchase to replace or refund.  (Refund will be issued as store credit in the form of a Brownells gift card.)  

The M4E1 Lower Receiver delivers billet aesthetics in a forged package. This custom-designed enhanced forging is machined from 7075-T6 Aluminum and compatible with all mil-spec AR15 parts. Aside from the visual upgrades, this custom-engineered design provides features that challenge much more expensive billet options and simplify the assembly process for the at-home builder.

M4E1 LOWER RECEIVER IMPROVEMENTS:
  • Threaded Bolt Catch Roll Pin - Allows for simple installation of the bolt catch and virtually eliminates the chance to damage the finish during installation (pin included). 1/16" Hex Key required for assembly.
  • Integrated Trigger Guard - Eliminates the possibility of breaking the trigger guard tabs by integrating the trigger guard into the lower, creating a stronger more rigid platform to build upon.
  • Upper Tension Screw - Allows users to fine tune the fit of the upper and lower receiver using a nylon tipped tensioning set screw inserted in the grip tang of the lower receiver. This provides a tight fit with any standard AR15 upper receiver.
  • Threaded Takedown Pin Detent Recess - Allows user to easily install the Takedown Pin detent and spring with the use of a 4-40 set screw (no more launching detents across the room).
  • Increased Magwell Flare - Increased the flare of the magwell to aid in quick and efficient magazine changes.
  • Marked and milled to accept short-throw safety selectors, but will work with standard selectors as well.

SPECS

  • Platform: AR15
  • Material; Machined from 7075-T6 forged aluminum
  • Markings: "Cal Multi", "M4-" Serial Number Designation
  • Compatibility: Works with standard AR15 components and magazines
  • Weight(s): 8.61 oz
  • Other: Rear takedown pin detent hole is threaded for a 4-40 set screw. Threaded Bolt Catch Roll Pin (Included).

INCLUDES:
  • Stripped M4E1 Lower Receiver
  • Nylon tipped tensioning set screw
  • Threaded Bolt Catch Pin
Specifications

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Restriction

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