The Midwest Industries AR .308 Lower Receiver Block (brand part no. MI-LRB308) is a polymer vise-clamp fixture sized to hold an AR-10 pattern .308 lower receiver steady during disassembly, reassembly, or pin work. Midwest Industries builds the block from polymer rather than metal specifically so it won’t mar the receiver’s finish or anodizing when clamped in a bench vise. Holding a lower receiver securely without damaging it is a basic requirement for detail work like trigger group installation or pin removal, and a dedicated block does that far more reliably than improvised padding. Stock it with the rest of our gunsmithing tools and gunsmith supplies for AR-10/.308 build work.

Key Specifications

• AR .308/AR-10 Fitment Sized specifically for AR-10 pattern .308 lower receivers.
• Polymer Construction Non-marring material that protects the receiver’s finish and anodizing when clamped.
• Vise-Clamp Format Designed to be held in a bench vise rather than used as a standalone fixture.

Frequently Asked Questions

Why use a polymer block instead of clamping the receiver directly? Direct clamping in a metal vise risks scratching or denting the receiver’s finish, while a polymer block spreads the clamping force safely.

Does this block work for standard 5.56 AR-15 lowers too? No, it’s sized specifically for the larger AR-10 pattern .308 lower receiver rather than the smaller AR-15 platform.

Buy the Midwest Industries AR .308 Polymer Lower Receiver Block

Bench work on a lower receiver goes smoother when it’s held securely without risking the finish. Order this block from our Lubbock, Texas gun shop for fast, insured shipping to your bench.