Yankee Hill Machine Co Low Profile Clamp-On Gas Block Pinch Screw .750 Black YHM-9384 UPC 816701013580
Product Description
The Yankee Hill Machine Co. Low Profile Clamp-On Gas Block (YHM-9384) is a precision-machined steel gas block engineered for AR-15 and AR-10/LR-308 rifle barrels with a .750-inch gas seat diameter. Featuring a low-profile exterior contour, this gas block fits cleanly underneath free-float handguards and rail systems without contacting internal handguard walls or causing barrel harmonics distortion.
Unlike traditional set-screw gas blocks that dimple or gouge barrel steel, the YHM-9384 utilizes a dual pinch-screw clamping mechanism. This clamp-on design distributes uniform circumferential clamping pressure around the barrel's gas seat journal, providing exceptional resistance to axial movement and gas leakage without scarring or distorting the barrel bore. The precision-bored gas port hole ensures full gas tube alignment and efficient energy transfer to the bolt carrier group.
Precision CNC-machined from high-strength alloy steel, the unit receives a corrosion-resistant black finish designed to withstand harsh carbon fouling, intense barrel heat, and environmental exposure. Ideal for duty builds, suppression hosts, and custom AR builds, the YHM-9384 provides a rock-solid, non-marring gas block interface for carbine-, mid-, and rifle-length gas systems.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fitment for all AR-15, AR-10, LR-308, and custom barrels featuring a .750" diameter gas block journal. Designed to clear all standard small-diameter free-float handguards.
- Clean the barrel gas seat journal and gas port area thoroughly using a degreaser to remove oil and debris.
- Slide the YHM-9384 gas block over the muzzle onto the gas seat journal, aligning the gas block port vertically with the barrel gas port.
- Insert the gas tube into the top port of the gas block and secure it by driving the gas tube roll pin fully through the block housing.
- Apply medium-strength threadlocker (Blue 242/243) to the pinch screw threads and torque evenly in an alternating fashion to manufacturer specifications (20–25 in-lbs).
Key Features
- Low Profile Architecture: Engineered with minimal external dimensions to tuck completely underneath narrow free-float rail systems.
- Non-Marring Clamp-On Design: Pinch-screw clamping system eliminates the need for barrel dimpling while providing maximum holding force.
- Precision .750" Bore: CNC-machined internal diameter matches standard .750-inch barrel gas seat journals for a gas-tight seal.
- High-Strength Alloy Steel: Heavy-duty steel body resists gas erosion, thermal expansion, and physical impact.
- Black Finish: Durable finish provides long-term protection against corrosion, chemical solvents, and carbon buildup.
Product Specifications
- Brand: Yankee Hill Machine Co. (YHM)
- Model/Series: Low Profile Clamp-On Gas Block
- MPN / SKU: YHM-9384
- UPC: 816701013580
- Gas Seat Diameter: .750 Inch
- Attachment Style: Dual Pinch Screw / Clamp-On
- Platform Fitment: AR-15 / AR-10 / LR-308 (.750" Barrel Journal)
- Material: Alloy Steel
- Finish/Color: Matte Black
- Country of Origin: United States
