Yankee Hill Machine Co. 6" Picatinny Rail Extension — Mount, Black (YHM-9473 | UPC 816701014372)
Need extra rail space without rebuilding your rifle? The Yankee Hill Machine Co. (YHM) 6" Picatinny Rail Extension gives you a strong, lightweight, and precise way to push optics and accessories forward for better ergonomics and balance. Machined to MIL-STD-1913 Picatinny specs and finished in low-glare black, the YHM-9473 adds a rigid 6-inch platform ideal for LPVOs, magnifiers, night vision/thermal clip-ons, IR lasers/illuminators, and offset red-dot mounts—while keeping your zero steady through recoil and rough use.
Why Choose the YHM-9473 6" Picatinny Rail Extension
Gain Usable Real Estate: Add six inches of true Picatinny rail to accommodate longer scopes, tandem setups (dot + magnifier), or front-mounted NV/thermal devices.
Optimize Eye Relief & Head Position: Push optics forward for natural eye alignment, a cleaner cheek weld, and improved heads-up posture—especially useful with armor, backpacks, or gas masks.
MIL-STD-1913 Precision: True Picatinny geometry ensures secure, repeatable clamping with rings, one-piece scope mounts, and accessory shoes from top manufacturers.
Rigid, Duty-Ready Build: YHM’s proven machining yields a stout, low-flex extension that resists shift under recoil, heat, and field abuse—so your zero stays put.
Low-Glare Black Finish: Durable protective coating minimizes reflections and blends seamlessly with black receivers and handguards.
Easy Install: Attaches to your existing Picatinny top rail with standard hardware—no gunsmith required.
Ideal Applications
LPVOs & Traditional Scopes: Achieve correct ring spacing and eye relief on AR-pattern rifles without compromising stock position.
Red Dot + Magnifier Combos: Space out your optic stack for comfortable eye box and smooth flip-to-side transitions.
Night Vision / Thermal Clip-Ons: Create the bridge length needed for inline devices ahead of day optics while keeping a straight sight-through.
Laser/Illuminator Layouts: Push IR/visible units forward for better clearance and cable routing, freeing up handguard slots.
Offset Optics: Set a 45° red dot or backup sight further out for faster transitions and less clutter near the receiver.
Key Features at a Glance
Length: 6 inches of MIL-STD-1913 Picatinny rail
Interface: Picatinny top & bottom, compatible with most modern receivers and monolithic uppers
Finish: Black, low-glare protective coating
Construction: Precision-machined for rigidity and repeatable mounting
Model / MPN: YHM-9473
UPC: 816701014372
Note: Weight and hardware style may vary slightly by production lot. Always follow recommended torque values and re-verify zero after installation.
Installation Tips for a Rock-Solid Setup
Clean & Degrease: Wipe mating rail surfaces; remove oils that can reduce clamping friction.
Receiver-First Mounting: When possible, mount the extension primarily on the upper receiver rail (or a true monolithic rail) to minimize POI shift from handguard flex.
Torque to Spec: Use a quality torque driver and apply medium threadlocker if your SOP requires it.
Level & Align: For optics, ensure the extension is square to the bore; level the reticle after ring installation.
Confirm Zero: Re-zero after installation and re-check following transport, temperature swings, or heavy round counts.
Compatibility Notes
Works with AR-15/AR-10, PCCs, precision chassis systems, and any platform featuring a top Picatinny rail.
Supports scope rings, one-piece mounts, red dots, magnifiers, NV/thermal clip-ons, lasers, and backup sights designed for Picatinny.
For co-witness goals (absolute/lower 1/3 with irons), remember this is an extension, not a riser—sight height remains unchanged.
Benefits You’ll Notice Immediately
Cleaner Ergonomics: Proper optic placement = faster acquisition and less neck strain.
Better Accessory Management: More forward space simplifies cable routing and clears congested rail sections.
Repeatable Accuracy: Rigid extension helps maintain consistent return-to-zero during real-world use.
Frequently Asked Questions
Will this extension change my zero?
Any time you move an optic, re-zero. Properly installed, the YHM-9473 provides a stable interface to hold zero through recoil and handling.
Can I bridge receiver and handguard?
Best practice is to mount on a single rigid plane (receiver or monolithic upper). If bridging to a free-float handguard, ensure minimal flex to avoid POI shift.
Is this a riser?
No—this is a rail extension. It increases length, not height. If you need additional height, pair with a separate optic riser.
What optics and accessories fit?
Anything designed for MIL-STD-1913 Picatinny: LPVO rings, one-piece scope mounts, red dots, magnifiers, clip-on NV/thermal, lasers, and BUIS.
SEO Highlights (Naturally Integrated)
Yankee Hill Machine 6" Picatinny rail extension, YHM YHM-9473, black rail mount, MIL-STD-1913 Picatinny extension, AR-15/AR-10 optic extension, scope eye-relief adjustment, red dot + magnifier spacing, NV/thermal clip-on bridge, laser/illuminator placement, UPC 816701014372.
Bottom Line
The YHM-9473 6" Picatinny Rail Extension is the straightforward, bomb-proof way to get the rail space your rifle actually needs. With true Picatinny geometry, a durable black finish, and six inches of rigid mounting surface, it streamlines optic placement, accessory layout, and overall handling—so your setup works with you, not against you.
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