Midwest Industries AR-15 Lower Receiver Block – .223/5.56 NATO

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Midwest Industries Upper Receiver Rod - AT3 Tactical

Midwest Industries Upper Receiver Rod


Midwest Industries Upper Receiver Rod - AT3 Tactical

Midwest Industries Upper Receiver Rod for AR 15

All-in-one Lower Receiver Block For .223/5.56 Builds

The Midwest Industries AR-15 Lower Receiver Block is an innovative tool that combines the traditional lower receiver block, gas block roll pin, and, magazine vice block into one polymer unit. It’s the ultimate assembly tool for gunsmiths and building enthusiasts to help AR-15 builders to save money and time, compared to using multiple tools.

The MI Lower Receiver Block utilizes either the .223 Remington/5.56 NATO or the .308 Winchester/7.62 NATO AR receiver platforms making the most tedious tasks in building an AR-style firearm fast and simple. It can also be mounted to a workbench, or used in a vise and hold a lower receiver by the magazine well.

Most Ideal Tool For Building ARs

The Midwest Industries AR-15 Lower Receiver Block features a gas block roll pin installation section, a trigger guard installation section, a fire control pin assembly, and many other applications outside of its classic use, making it the most ideal tool for building an AR-15 rifle.

This model is made specifically for the .223 Remington/5.56 NATO. If you need one for the larger AR-308, SR25, and AR-10 patterns, click here. 


  • Designed to work with Mil-Spec AR15 forged lowers
  • High-strength polymer construction
  • Allows for gas block roll pin installation
  • Mounting holes for attachment to bench or alternative work surface
  • Parallel edges for vice use
  • Trigger guard installation section
  • Allows lower to be held for multiple aspects of assembly
  • Fire control pin assembly
  • Able to hold the complete firearm for maintenance
  • Small parts tray
  • Weight: 12.0 oz
  • Height: 6.5”
  • Length: 5.0”
  • Width: 1.25”
  • Made in the USA

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Midwest Industries Limited Lifetime Warranty

  • Midwest Industries, Inc. stands behind every item we produce. If you are the original purchaser and a MI product fails due to manufacturing, assembly, or material defect, and you have not modified or abused the item, it will be repaired or replaced for life.
  • Modification or alteration to these parts including custom coatings, voids all factory warranties.
  • We are not responsible for items intentionally/accidentally damaged or destroyed, or products damaged by abuse/poor maintenance.
  • This warranty is limited to the repair or replacement of the part or parts which are returned to Midwest Industries, Inc. and are determined by Midwest Industries, Inc. to be defective.
  • This warranty, made to the original owner/purchaser, is not transferable.

The following items are excluded from this warranty:

  1. Normal wear of product finishes and of all metal or plastic parts.
  2. Damage or malfunction resulting from accident, negligence, misuse, or unauthorized repair or modification.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.