Luth-AR Pistol Length Gas Tube – Precision Gas System for AR‑15 BL‑04B
Experience unmatched reliability and smooth operation with the Luth-AR Pistol Length Gas Tube, expertly engineered to fit the AR‑15 BL‑04B platform. Designed for pistol‑length builds, this gas tube delivers a compact, lightweight solution without compromising on performance, making it the ideal upgrade for tactical, competition, or everyday carry rifles.
Key Features
- Exact Fit for BL‑04B: CNC‑machined tolerances ensure a perfect match with the BL‑04B lower receiver, eliminating the need for aftermarket modifications.
- Optimized Gas Flow: Patented gas port design provides consistent pressure, reducing recoil and improving cycling reliability.
- Durable Construction: Built from high‑grade 4130 chromoly steel with a black phosphate finish for corrosion resistance.
- Lightweight Profile: Pistol‑length dimensions reduce overall rifle length and weight, enhancing maneuverability.
- Easy Installation: Threaded end caps and a standard 1/2‑in. gas block interface make installation straightforward with common tools.
- Compatibility: Works with all standard AR‑15 upper receivers, direct‑impingement gas systems, and a wide range of bolt carriers.
Why Choose Luth-AR?
Luth‑AR has a reputation for precision engineering and quality control. Every gas tube undergoes a rigorous 100% inspection process, ensuring that each unit meets strict performance standards. Whether you’re building a new pistol‑length AR‑15 or upgrading an existing platform, the Luth‑AR Gas Tube provides the confidence of a flawless gas system that cycles every round reliably.
Technical Specifications
| Model | Luth-AR Pistol Length Gas Tube (BL‑04B) |
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| Length | 5.5 inches (140 mm) overall length |
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| Material | 4130 chromoly steel, black phosphate coating |
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| Thread Size | 1/2‑in. (13.5‑LP) for standard gas block |
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| Weight | 0.28 lbs (127 g) |
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| Compatibility | AR‑15 BL‑04B lower, direct‑impingement gas systems, standard bolt carrier groups |
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| UPC | 859819007676 |
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Benefits for Your Build
• Enhanced Accuracy: Consistent gas pressure reduces bolt bounce, improving shot‑to‑shot precision.
• Reduced Recoil: Optimized flow diminishes felt recoil, allowing faster follow‑up shots.
• Improved Reliability: Eliminates stovepipe jams and misfeeds common in poorly tuned gas systems.
• Compact Design: Ideal for close‑quarters combat, home defense, and competition where a shorter overall length is critical.
• Easy Maintenance: Simple disassembly for cleaning and inspection without special tools.
Installation Guide (Quick Overview)
- Remove the existing gas tube from the upper receiver.
- Inspect the gas block threads for any debris and clean if necessary.
- Slide the Luth‑AR gas tube into the gas block, aligning the gas port with the barrel’s gas port.
- Secure the tube with the supplied set‑screw or lock‑nut, ensuring a snug fit.
- Reassemble the upper receiver and perform a function test to verify proper cycling.
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Customer Assurance
All Luth‑AR products come with a limited lifetime warranty against manufacturing defects. Our dedicated support team is available to assist with any installation questions or performance concerns, ensuring you get the most out of your pistol‑length AR‑15 build.
