Phase 5 Low Profile Gas Block Clamp Screw .750 Black - LOPROGAS

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Phase 5 Low Profile Gas Block Clamp Screw 0.750 Black LOPROGAS UPC 813318021663

Product Description

The Phase 5 Low Profile Gas Block Clamp Screw edition (LOPROGAS) is a rugged, ultra-compact gas block designed for AR-15 and AR-308 pattern rifles utilizing a standard .750" gas journal barrel profile. Engineered to replace bulky A2 front sight posts and heavy factory gas blocks, this low-profile component provides the tight clearance needed to fit smoothly underneath slimline, free-float handguards and M-LOK rail systems.

Precision CNC-machined in the USA from heavy-duty 4140 chromoly steel, the Phase 5 clamp-style gas block offers exceptional resistance to intense gas erosion, high thermal stress, and barrel flex. Treated with a durable manganese phosphate finish, the block resists carbon corrosion and environmental wear. The dual clamp-screw architecture evenly distributes clamping pressure across the barrel surface, delivering a rock-solid, non-marring seal that maintains proper gas port alignment without requiring barrel dimpling.

Featuring a slim overall width of 0.90 inches and a weight of just 1.8 ounces, the LOPROGAS block maintains critical barrel harmonics and minimal front-end weight. Supplied with two high-grade clamping screws (recommended torque spec: 30 in-lbs), the Phase 5 Low Profile Gas Block delivers a combat-proven, leak-free gas seal for duty carbines, precision long-range builds, and custom AR rifles.

Armorer Bench Notes & Real-World Staging Guidance:
Fitment Matrix: Fits standard AR-15, AR-308, and PCC barrels featuring a 0.750" gas block journal. Compatible with carbine, mid-length, and rifle-length gas system tubes.

1. Perform a complete firearm safety check: drop the magazine, pull the charging handle rearward, and visually inspect the chamber to ensure zero live rounds are present.
2. Slide your gas tube into the top port of the Phase 5 gas block and secure it using a stainless steel gas tube roll pin (note: gas tube roll pin is typically supplied with the gas tube).
3. Degrease the barrel gas journal and internal bore of the gas block to ensure a clean surface contact.
4. Slide the gas block assembly onto the barrel, aligning the gas block port precisely with the barrel's gas port hole.
5. Apply a drop of high-temperature threadlocker (such as Blue Loctite 242 or Rocksett) to the two clamping screw threads.
6. Torque the two clamp screws evenly in alternating increments to 30 in-lbs using an inch-pound torque wrench, then reinstall the handguard and perform a manual action check.

Key Features

• Ultra-Low Profile Geometry: Fits beneath slim free-float handguards and tight M-LOK / KeyMod rail channels.
• Dual Clamp-Screw Mounting: Provides a secure, uniform 360-degree seal around the barrel without marring or dimpling.
• Precision 4140 Chromoly Steel: Aircraft-grade steel construction resists throat erosion, gas cutting, and high thermal expansion.
• Manganese Phosphate Finish: Mil-Spec protective surface coat shields against carbon buildup, chemicals, and moisture.
• Standard 0.750" Journal Compatibility: Direct fit for standard profile AR-15 and AR-10/308 tactical barrel profiles.
• Made in the USA: Precision CNC-machined domestically using American-sourced raw materials.

Product Specifications

• Brand: Phase 5 Weapon Systems
• Model/Series: Low Profile Gas Block (Clamp Screw)
• MPN / SKU: LOPROGAS / Gas Block - Lo Pro Clamp
• UPC: 813318021663
• Barrel Journal Diameter: 0.750 Inches
• Mount Style: Dual Clamp Screw
• Material: 4140 Chromoly Steel
• Finish / Color: Manganese Phosphate / Black
• Width: 0.90 Inches
• Height: 1.48 Inches
• Weight: 1.8 oz
• Torque Spec: 30 in-lbs
• Country of Origin: USA