Brownells Ar-15 Modular Gas Block Kit With Rail, 0.750''

The Brownells AR-15 modular gas block kit with rail brings serious configuration flexibility to your rifle build. Unlike fixed gas blocks that lock you into one mounting setup, this 0.750" model comes with an integral Picatinny rail and the ability to add up to three additional rails in the positions that matter for your mission. Whether you're mounting a laser, tactical light, night vision optic, or backup sight, you can attach and remove side and bottom rails with just two screws per rail—no permanent commitments, no guesswork.

Built from 6061 billet aluminum, the gas block delivers the strength you need for demanding use without unnecessary weight. The precision-machined construction pairs with three hardened steel setscrews that anchor the block securely to your barrel, so it stays put through training, hunting, or competition cycles. The modular design means you can reconfigure your setup between range sessions or tactical exercises without swapping the entire block.

This is purpose-built for shooters who want their AR platform to adapt to the job at hand—not the other way around. Brownells' approach here is practical: solid engineering, simple installation, and the freedom to add and remove accessories as your needs change.

Key Features

• Integral fixed Picatinny rail included; supports up to three additional modular rails
• Modular rails attach with two screws each for fast reconfiguration
• 6061 billet aluminum construction for strength and lightweight performance
• Three hardened steel setscrews secure the block to your barrel
• Fits 0.750" diameter barrels
• Compatible with AR-15 platform rifles

Specifications

Frequently Asked Questions

Will this gas block fit my AR-15 barrel?

This model is designed for 0.750" diameter barrels and is compatible with AR-15 platform rifles. Confirm your barrel's diameter before ordering to ensure proper fit.

Can I mount multiple accessories on this gas block?

Yes. The block includes one integral Picatinny rail and accepts up to three additional modular rails on the sides and bottom, allowing you to mount lasers, lights, night vision optics, backup sights, and other tactical gear.

How do I install and configure the modular rails?

The side and bottom rails attach with two screws each, making installation and removal straightforward. You can add, remove, or reposition rails to suit your setup without tools beyond a screwdriver.

What comes in this kit?

The kit includes the gas block with integral rail and the hardware (three setscrews and rail attachment screws) needed for installation on your barrel.