Yankee Hill Machine Co Gas Block Riser Mount Black Picatinny YHM 230 UPC 816701014303
Product Description
The Yankee Hill Machine Co. (YHM) Gas Block Riser Mount (YHM-230) in Matte Black is a specialized, precision-machined rail riser designed to solve front sight height alignment issues on AR-15 platforms equipped with same-plane or low-profile gas block rails. Delivering an exact height elevation boost across a compact 1.25-inch Picatinny footprint, this riser elevates gas-block-mounted flip-up front iron sights to match the exact optical plane of upper receiver top rails.
Precision CNC-machined in the USA from 6061-T6 aircraft-grade aluminum, the YHM-230 features a heavy-duty side-clamping jaw secured by a steel cross-bolt. This design delivers uniform, high-pressure clamping force across gas block Picatinny slots, maintaining a rigid lockup that withstands severe barrel heat, gas erosion, and recoil vibration.
Finished in a durable Mil-A-8625 Type III Hard-Coat Anodized black coating, the YHM Gas Block Riser allows shooters to install standard upper-receiver-height flip-up front sights onto gas blocks, ensuring precise front-to-rear iron sight plane co-witnessing with optical aiming devices.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Mounts to any Picatinny-railed gas block. Specifically designed to elevate front flip-up iron sights intended for upper receiver height up to proper sight alignment when mounted on lower gas block rail heights.
- Ensure the host firearm upper receiver is completely clear, magazine removed, and chamber visually and physically verified empty.
- Clean barrel and gas block rail surfaces to remove carbon and oil residue before mounting.
- Place the YHM-230 riser onto the gas block Picatinny rail section, pushing forward toward the muzzle so the steel cross-bolt seats firmly into the rail slot.
- Torque cross-bolt to 30–35 in-lbs using a quality hex tool. Attach flip-up front sight onto the elevated riser slot and confirm front and rear iron sight height alignment.
Key Features
- Same-Plane Sight Height Alignment: Elevates low gas block rails to match upper receiver Picatinny top rail height.
- 1.25" Compact Picatinny Footprint: Provides 3 Picatinny rail slots—just enough length for standard front sight bases.
- Aircraft Grade 6061-T6 Aluminum: Precision CNC-machined for extreme strength and high heat tolerance near the gas port.
- Steel Cross-Bolt Clamping Jaw: Delivers high-torque mounting lockup that will not loosen under rapid-fire thermal expansion.
- Type III Hard-Coat Anodization: Matte black Mil-Spec finish resists chemical solvents, heat wear, and corrosion.
Product Specifications
- Brand: Yankee Hill Machine Co. (YHM)
- Model/Series: Gas Block Picatinny Riser Mount
- MPN / SKU: YHM-230 / YHM230
- UPC: 816701014303
- Rail Footprint: 1.25 Inches (3 MIL-STD-1913 Picatinny Slots)
- Function: Elevates Gas Block Rail to Receiver Height
- Material: 6061-T6 Aircraft Aluminum with Steel Clamp Hardware
- Finish/Color: Type III Hard-Coat Anodized Matte Black
- Country of Origin: United States
