Fierce Firearms Chassis Kit — Tungsten Gray | Fits AR-15 Long-Action* | Model LACHSTU | UPC 853418803936
Modernize your rifle with a purpose-built precision backbone. The Fierce Firearms Chassis Kit in Tungsten Gray (LACHSTU) delivers the rigidity, adjustability, and modularity serious shooters demand—turning your build into a repeatably accurate, bag-friendly, and accessory-ready platform. With broad M-LOK® coverage, a tunable buttstock section, and a rock-solid bedding interface, this chassis helps you lock in natural eye alignment, tame recoil movement, and shrink groups—whether you’re hunting, shooting steel, or training positional skills.
Model/SKU: LACHSTU
UPC: 853418803936
Finish/Color: Tungsten Gray (low-glare, abrasion-resistant)
Fitment: AR-15 long-action* pattern (see important compatibility notes below)
*“Long action” here refers to receiver/bolt-length compatibility defined by the manufacturer. Standard AR-15 receivers are traditionally “short” pattern; always verify your upper/lower interface, cartridge overall length, bolt, magazine spec, buffer system, and mounting points before purchase.
Why Upgrade to the Fierce Tungsten Chassis
Rigid accuracy foundation: The monolithic chassis minimizes flex and bedding shift, helping your zero stay put through heat cycles, travel, and seasonal swings.
Shooter-first ergonomics: Adjustable cheek riser and length of pull let you dial a relaxed, repeatable head position for faster target acquisition and less parallax error.
M-LOK® everywhere you need it: Mount bipods, ARCA plates, barricade stops, QD sling cups, and internal/external weights exactly where performance demands—without unnecessary bulk.
Tungsten Gray durability: A premium, low-reflectivity finish that looks professional and shrugs off weather, dust, and range abuse.
Better balance & recoil tracking: Flat, bag-friendly geometry and weight-tuning options promote straight recoil and quicker sight return for faster corrections.
Future-proof modularity: Update optics, supports, and accessories over time without changing your core chassis.
Key Features at a Glance
Platform: AR-15 “long-action” receiver spec (manufacturer-defined; verify interface for your build)
Adjustability: Cheek height & length of pull micro-adjustment (tool or tool-less varies by package—confirm contents)
Forend: M-LOK® slots at multiple clock positions for accessories and weights; ARCA compatibility via M-LOK® adapters
Buttstock Section: Flat underside for consistent rear-bag tracking; integrated QD sling points (check inclusion)
Grip Interface: Accepts standard AR-style pistol grips (choose your preferred angle and texture)
Finish: Tungsten Gray, abrasion-resistant, low glare
Model: LACHSTU | UPC: 853418803936
What’s in the box may vary. Confirm included mounting hardware, spacers, QD cups, and any ARCA/weight kit compatibility with your retailer before purchase.
Real-World Performance Benefits
Repeatable precision: Rigid bedding and consistent interface help deliver predictable cold-bore impacts and tight vertical through strings.
Natural eye alignment: Fine cheek and LOP adjustments reduce neck strain and parallax—vital for long days on glass.
Positional stability: Forend and butt geometry integrate cleanly with barricades, tripods, and rear bags for PRS-style practice and field use.
Weatherproof confidence: Non-warping chassis construction resists moisture and temperature shifts better than traditional stocks.
Ideal Use Cases
Predator & varmint hunting: Pair with a compact bipod and rear bag for steady, low-recoil strings on small targets across open country.
Long-range/steel practice: Build a forgiving positional rifle with tuned balance and repeatable ergonomics.
General precision carbine: Combine with a quality barrel and optic for a versatile rig that handles near-to-far engagements.
Compatibility & Fit Notes
Receiver interface: Built for the manufacturer’s AR-15 “long-action” specification. Verify your upper/lower geometry, bolt/magazine spec, and recoil/buffer system.
Barrel & gas system clearance: Confirm barrel contour, gas block size, and handguard/forend clearance if adding full-length ARCA or weight systems.
Grips & accessories: Accepts most AR-style pistol grips and M-LOK® accessories.
Magazine system: Ensure your cartridge and magazine standard match the chassis’ cut and latch geometry.
Suggested Setup (Pro Tips)
Optic: 3–15x or 4–16x with a zero stop and dependable tracking; mount as low as practical, then set cheek height to match.
Support: A cant/lock bipod, a small rear bag, and a low-profile barricade stop up front.
Trigger: A crisp single- or two-stage trigger maximizes the chassis’ stability advantage.
Balance: Add M-LOK® weights or an ARCA plate to tune center of gravity for your positional style.
Sling: Two-point QD sling for hike-in carry and quick loop-up shooting support.
Installation (Quick Guide)
Unload & clear your firearm.
Separate upper/lower; remove existing stock/handguard/furniture as required.
Seat & torque the receiver into the chassis per manufacturer specs; use thread prep where directed.
Adjust cheek riser and LOP to your optic height and posture; lock settings.
Verify function: Magazine insertion/ejection, safety, trigger operation, bolt travel.
Zero & confirm: Re-check torque after the first range session and validate zero.
New to chassis installs? A qualified armorer can ensure correct torque, thread prep, and magazine fitment.
Care & Maintenance
Wipe down with a damp cloth; avoid harsh solvents on coated surfaces.
Re-torque action screws and forend accessories seasonally or after travel.
Inspect M-LOK® hardware and QD points; use thread prep per accessory maker.
Protect exposed fasteners with a light corrosion inhibitor in humid/salty environments.
Specifications (Quick Reference)
Brand: Fierce Firearms
Product: Chassis Kit (Tungsten Gray)
Fitment: AR-15 long-action pattern (manufacturer-defined; verify your receiver and cartridge system)
Adjustability: Cheek height & length of pull
Mounting: M-LOK® forend; QD sling provisions (varies by package)
Finish: Tungsten Gray, low-glare, abrasion-resistant
SKU: LACHSTU
UPC: 853418803936
Frequently Asked Questions
Q: Will this fit a traditional AR-10 (.308) large-frame build?
A: This model targets the manufacturer’s AR-15 “long-action” spec. AR-10/LR-308 patterns differ dimensionally. Confirm fitment before purchase.
Q: Is an ARCA rail included?
A: Typically sold M-LOK®-only; add ARCA plates/rails as needed. Check your retailer’s listing for included hardware.
Q: Can I add a folding mechanism?
A: Folding adapters depend on your buffer/receiver extension and recoil system. Verify compatibility with your chosen folder.
Q: What torque values should I use?
A: Follow Fierce/ accessory-maker torque specifications for action screws and M-LOK® fasteners; witness-mark critical screws.
Q: Does the Tungsten finish match other “tungsten” parts?
A: The hue is a premium neutral gray; minor shade differences can occur across brands and coatings.
SEO-Friendly Highlights (Naturally Woven)
Fierce Firearms Chassis Kit Tungsten Gray, AR-15 long-action precision chassis, adjustable cheek riser & LOP, M-LOK® forend, rigid bedding for repeatable accuracy, rear-bag-friendly stock geometry, modular precision rifle chassis LACHSTU, UPC 853418803936.
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Meta Title: Fierce Firearms Chassis Kit — Tungsten Gray | AR-15 Long-Action | LACHSTU
Meta Description: Upgrade your rifle with the Fierce Tungsten Gray Chassis Kit. Adjustable cheek/LOP, M-LOK® forend, rigid accuracy foundation, and bag-friendly geometry. Model LACHSTU — UPC 853418803936.
Build your rifle around rigidity, adjustability, and modular control—the Fierce Firearms Tungsten Gray Chassis Kit (LACHSTU) is the precision base your advanced AR build deserves.
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