Broaching of an Aluminum Lower Receiver Cavity

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Project: Broaching of an Aluminum Lower Receiver Cavity 
Industry: Firearm Industry

This project demonstrates our expertise at providing precision broaching that meets the tough demands of military and firearms industry. Illinois Broaching Co., Inc. produces these lower receiver cavities in production volumes that average 3,750 pieces per week. At the start of the project, we fabricated precision broach tooling and fixtures that would perform accurately with repeatability on these 7075 T-6 forged aluminum rifle components. We are able to broach the cavities with a precision accuracy of ±.002″ on these 8.5” long by 1.75-4.00″ wide work pieces. Committed to quality, we conduct careful inspections to ensure that dimensional tolerances are met. We ship the finished parts to the customer along with all applicable quality documentation and certifications required by the military and firearms industry.

Highlights of this Production Broaching Project

Product Description These lower receivers are used in the AR-15 Assault Rifle.
Precision Broaching Capabilities Applied/Processes
Equipment Used to Manufacture Part
CAD Systems
Surface Grinder
Broach Grinder
Overall Part Dimensions
Length: 8.500"
Width: 1.750 x 4.000"
Tightest Tolerances± 0.002"
Material Used7075 T-6 Forged Aluminum – Customer Supplied
In process testing/inspection performed
Inspection Reports
  • Gage Inspection, Location
Industry for Use
Military Industry
Firearm Industry
Delivery LocationIllinois
Standards MetCustomer Specifications, CAD Drawing
Product NameLower Receiver Cavity

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