The Midwest Industries Lower Receiver Block (brand part no. MI-LRB) is a high-strength polymer vise block built to secure an AR-style lower receiver during some of the most tedious steps of a build. It fits both .223 Remington/5.56 NATO and .308 Winchester/7.62 NATO AR receiver sets, and includes dedicated sections for gas block roll pin installation, trigger guard installation, and fire control pin assembly, along with other applications beyond its core use. It is made in the USA.

Key Specifications

• It is molded from high-strength polymer, sized as a vise block for AR lower receivers.
• It fits both .223 Remington/5.56 NATO and .308 Winchester/7.62 NATO receiver sets.
• It includes a dedicated section for gas block roll pin installation.
• It includes a dedicated section for trigger guard installation.
• It includes a dedicated section for fire control pin assembly.
• It is made in the USA.

Frequently Asked Questions

What receiver sizes does this block fit? Both .223 Remington/5.56 NATO and .308 Winchester/7.62 NATO AR receiver sets.

What build steps does it help with? Gas block roll pin installation, trigger guard installation, fire control pin assembly, and other general bench applications.

Buy the Midwest Industries Lower Receiver Block

A dedicated vise block turns the fussiest steps of an AR build into a five-minute job. Order it from Midwest Industries through our Lubbock, Texas gun shop for fast, insured shipping, and browse more of our gunsmithing tools.