Yankee Hill Machine Co. Scope Riser Mount — 1/2" Rise, 5.25" Length, Black, Picatinny (YHM-227A | UPC 816701014891)
Get your optic where it needs to be—fast, solid, repeatable. The Yankee Hill Machine Co. (YHM) Scope Riser Mount delivers a 1/2-inch rise across a 5.25-inch platform to optimize eye alignment, cheek weld, and accessory clearance on modern rifles. Precision-machined for MIL-STD-1913 Picatinny rails and finished in a durable black coating, the YHM-227A is a proven solution for elevating scopes, red dots, magnifiers, and night-vision/thermal bridges—without compromising rigidity or return-to-zero.
Why Choose the YHM-227A 1/2" Scope Riser
Corrects Sight Height: Adds 0.50" of elevation so your optic aligns with natural head position, improving comfort and speed—especially with plate carriers, ear pro, or gas masks.
Full 5.25" Rail Span: The extended length provides more ring spacing for long-body scopes and stable mounting footprints for larger optics or clip-on devices.
True Picatinny Geometry: Cut to MIL-STD-1913 specs for broad compatibility with scopes, red dots, magnifiers, and mounts from major brands.
Hard-Use Build: YHM’s reputation for no-nonsense, duty-ready machining means you get a riser that resists flex, maintains zero, and shrugs off recoil.
Low-Glare Black Finish: Durable black treatment reduces reflections and blends with most receivers and handguards for a clean, unified look.
Simple Install: Attaches to your upper receiver’s Picatinny rail with standard hardware—no gunsmith required.
Ideal Setups & Use Cases
LPVOs & Traditional Scopes: Achieve proper ring spacing and line-of-sight height for comfortable cheek weld on AR-pattern rifles.
Red Dots & Magnifiers: Lift your dot to co-witness or lower 1/3 co-witness (depending on original mount), and line up a flip-to-side magnifier without chin-weld.
Night Vision / Thermal Bridges: Gain clearance above lasers, illuminators, and front sights while keeping a straight, repeatable sight picture.
Suppressor-Height & Gas Mask Shooting: Increase head-up posture for better situational awareness and less neck strain during long strings.
Key Features at a Glance
Rise Height: 1/2 inch (0.50")
Overall Length: 5.25 inches
Interface: MIL-STD-1913 Picatinny (top & bottom)
Material/Finish: Precision-machined, black low-glare finish
Application: Raises optics to improve ergonomics, clearance, and co-witnessing
Model / MPN: YHM-227A
UPC: 816701014891
Note: Exact weight and hardware style can vary slightly by production lot. Always torque to the optic manufacturer’s recommendations and re-verify zero after installation.
Installation Tips for a Rock-Solid Mount
Degrease & Inspect: Clean mating surfaces on both the upper receiver and riser.
Index & Seat: Place the riser on the receiver rail (avoid bridging to handguard rails unless the handguard is truly monolithic).
Torque Correctly: Tighten per hardware spec and use a quality torque driver. Apply a medium threadlocker if recommended by your department/agency SOP.
Mount Optic & Level: Set ring spacing, level the reticle, and torque rings to manufacturer spec.
Confirm Zero: Reconfirm after the first range session and after temperature swings or transport.
Compatibility Notes
Fits any firearm with a Picatinny top rail (AR-15, AR-10, PCCs, precision chassis, many shotguns/carbines).
Works with most scope rings, one-piece mounts, red dot footprints, and NV/thermal bridges designed for Picatinny.
For absolute or lower 1/3 co-witness targets, factor in your optic’s current mount height to select final sight height.
Benefits You’ll Notice on Day One
Faster Target Acquisition: Natural eye alignment means less time “hunting” for the sight window.
Better Comfort & Posture: Head-up position reduces neck fatigue in extended drills or patrols.
Cleaner Accessory Layout: Extra height helps clear BUIS, lasers, front sight posts, and cable runs.
Repeatable Accuracy: Rigid base supports consistent zero across range days and duty cycles.
Frequently Asked Questions
Q: Will the YHM-227A change my zero?
A: Any time you move an optic you must re-zero. Once torqued properly, the riser provides a stable interface for repeatable performance.
Q: Can I bridge this riser over the receiver and handguard?
A: Best practice is to mount fully on the receiver to avoid POI shift from differing flex between receiver and handguard (unless you’re using a true monolithic upper).
Q: How high will my total sight height be?
A: Add 0.50" to your current mount height. For example: a 1.41" red-dot mount becomes ~1.91" with the riser.
Q: Does it work with magnifiers?
A: Yes. The 5.25" length provides generous space and height to align red dots with flip-to-side magnifiers and maintain eye relief.
SEO Highlights (Naturally Integrated)
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The Bottom Line
The YHM-227A Scope Riser Mount is a simple, bomb-proof way to fix optic height issues, improve ergonomics, and clean up your accessory stack. With true Picatinny geometry, 0.50" rise, and a 5.25" rail span, it’s the go-to upgrade for shooters who demand comfort, speed, and repeatability from their setup.
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