Brownells Ar-15 Gas Tube Mid-Length Black Nitride

The Brownells AR-15 gas tube in mid-length configuration with black nitride finish is a straightforward replacement or upgrade component for your AR platform build. This stainless steel tube carries a black nitride coating that improves durability against corrosion and wear—practical benefits for shooters who run their rifles hard or in variable conditions. Mid-length gas systems strike a balance between carbine and rifle-length setups, making them a popular choice for general-purpose AR builds that see hunting, 3-gun, or serious range time.

Brownells is known for quality mil-spec parts, and this gas tube is no exception. The black nitride finish isn't just cosmetic; it adds genuine fatigue strength to the component, which matters in a part that cycles repeatedly under pressure. If you're building or refreshing an AR and want a proven, durable gas tube without guesswork, this is a solid choice that will integrate with standard AR-15 mid-length systems.

Keep in mind that the roll pin required for installation is sold separately—factor that into your build kit if you don't already have one on hand.

Key Features

• Mid-length gas tube configuration for balanced performance across AR-15 platforms
• Stainless steel construction with black nitride finish for corrosion and wear resistance
• Enhanced fatigue strength from the nitride coating to withstand cycling stress
• Standard AR-15 compatible design

Specifications

Frequently Asked Questions

What is a mid-length gas tube and how does it differ from carbine or rifle length?

Gas tube length determines where gas is tapped from the barrel and how the system cycles. Mid-length falls between carbine-length (shorter, faster cycling) and rifle-length (longer, softer recoil impulse), offering a practical middle ground for general-purpose AR-15 builds.

Will this gas tube work with my AR-15 build?

Yes, this is a standard AR-15 mid-length gas tube compatible with any mid-length AR-15 platform. Confirm your build spec calls for mid-length before ordering.

Do I need anything else to install this gas tube?

Yes—the roll pin that secures the gas tube is not included and must be purchased separately.

What does black nitride finish do?

Black nitride is a surface treatment that increases corrosion resistance, wear resistance, and fatigue strength, while also giving the component a professional appearance. It's a practical upgrade for shooters in wet climates or those running high round counts.