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Midwest Industries LRB
California Proposition 65 Warning

This product can expose you to chemicals including lead, known to cause cancer and birth defects. For more info visit P65Warnings.ca.gov.

Midwest Industries

LRB

$41.95
$36.95
Sale Price
Available California compliant

Midwest Industries Lower Receiver Block, Polymer Construction, Fits 223 Remington/5.56 NATO Receivers, Black MI-LRB

Key Details
Brand Midwest Industries
Manufacturer Part Number MI-LRB
UPC 812102033622
SKU MWMI-LRB
Current Stock 26 available
Quantity Updated Apr 23, 2026 10:30 PM
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Purchase Requirements
  • Final availability is confirmed at checkout.
In-Store Pickup Required: All firearm purchases must be picked up at our Beverly Hills location after background check completion.
Product Description

Midwest Industries is known for bringing the highest quality manufacturing processes and accessories to the firearms community. With their long history, they are pleased to bring their tricks and knowhow of building quality firearms to the end user's workbench with their high strength polymer Mag Block. Utilizing either the .223 Remington/5.56 NATO or the .308 Winchester/7.62 NATO AR receiver sets, this new mag block makes some of the most tedious tasks in building an AR-style firearm fast and simple. With features including 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, this lower receiver block will be the key to building your next firearm. Made in the U.S.A.

Features
  • High strength polymer construction
  • Mounting holes for attachment to bench or alternative work surface
  • 4 points of contact for vice use
  • Allows lower to be held for multiple aspects of assembly
  • Able to hold complete firearm for maintenance
  • Small parts tray
  • Weight: 12.0oz, Height: 6.5 Length: 5.0" Width: 1.25"
  • 100% Made in USA
Specifications
UPC: 812102033622
Manufacturer: Midwest Industries
Manufacturer Part #: MI-LRB
Model: LRB
Type: Vise Block