Fierce Firearms 7mm, 20" — AR-15 Compatible Barrel | Part # 2841820 | UPC 853418284803
Turn your AR-15 into a flat-shooting, wild-country performer. The Fierce Firearms 7mm, 20" AR-15 barrel (2841820) brings long, sleek 7mm bullet performance to the lightweight, modular AR platform. Designed for precision, reliability, and easy integration, this 20-inch tube balances velocity and handling to keep your carbine lively on the move while delivering the downrange consistency you expect from Fierce. Whether you’re building a backcountry predator rifle, a steel-range trainer, or an all-season varmint rig, this 7mm AR barrel helps you shoot flatter, farther, and with confidence.
Part / SKU: 2841820
UPC: 853418284803
Platform: AR-15 (standard AR-15 upper receiver interface)
Caliber: 7mm (.284") — verify specific chambering before purchase
Barrel Length: 20 inches
Why Choose a 7mm AR-15 Barrel from Fierce Firearms
7mm ballistics in a compact platform: Take advantage of high-BC 7mm projectiles for flatter trajectories and better wind performance than typical small-cal AR loads.
20" “do-everything” length: Optimized to add meaningful velocity over shorter carbines while keeping overall weight and balance field-friendly.
Precision machining: Concentric chambering and a true crown support repeatable POI and tight groups with quality ammunition.
AR-15 compatibility: Built for standard AR-15 receivers and accessories to keep your parts ecosystem simple and configurable.
Hunt- and range-ready durability: Premium barrel steel and protective finishing (varies by lot) help resist corrosion, heat, and hard use.
Key Features at a Glance
Caliber Bore: 7mm (.284") — chamber spec varies by SKU; confirm exact chamber (e.g., 7mm AR-compatible / wildcat) before ordering ammo
Length: 20" for balanced velocity/handling
Muzzle: Threaded for brakes/suppressors (where legal). *Common thread for 7mm is 5/8x24 — verify exact pitch for this barrel.
Gas System: AR-15 pattern (mid-length or rifle-length; verify for your build)
Extension: AR-15 barrel extension (M4 feed ramps typical; verify)
Material/Finish: Precision rifle-grade steel with protective finish (nitrided/Cerakoted or stainless depending on run; verify current spec)
Twist Rate: Optimized for long-for-caliber 7mm bullets (commonly fast-twist; confirm exact twist)
Fit & Build Notes: Before ordering, confirm your chambering, gas system length, muzzle thread, twist rate, and magazine compatibility. Some 7mm AR cartridges require specific magazines and bolts.
Real-World Performance Benefits
Wind-savvy impacts: Pair long, high-BC 7mm bullets with a 20" tube to maintain energy and stability farther downrange.
Smooth cycling: Proper gas tuning and quality machining promote reliable feed, fire, extract, eject—critical for field use.
Confident zero retention: A true crown and precise bore geometry support predictable cold-bore and follow-up shots.
Ideal Use Cases
Predator & varmint hunting: Flat trajectories and light recoil for ethical shots at varied ranges.
Practical steel & training: Learn wind and holds on a budget-friendly, AR-based system.
Backcountry carry: Keep weight manageable while gaining ballistic reach compared to common small-cal AR loads.
Smart Setup Recommendations
Bolt & mags: Use the correct bolt face and magazines for your specific 7mm chambering (e.g., Grendel-pattern mags if applicable).
Gas tuning: Start with the recommended buffer/spring for your gas length. An adjustable gas block helps tune recoil and reliability, especially with suppressors.
Muzzle device: Install a brake for recoil control during load development or a suppressor (where legal) for reduced blast; use proper shims and torque.
Optic: A lightweight 2-10x or 3-15x with a usable reticle and zero stop complements the barrel’s reach.
Installation (Quick Guide)
Unload & clear your firearm.
Secure the upper receiver in a proper vise block; remove existing barrel if present.
Seat barrel into the receiver with the correct barrel nut; torque to spec and verify alignment.
Install gas system: Gas block and tube matched to the barrel’s gas length; confirm port alignment.
Time muzzle device: Verify thread pitch, use shims as needed, and torque per manufacturer specs.
Function test: Check headspace with proper gauges, then verify lock-back and ejection pattern at the range.
If you’re unfamiliar with AR barrel installs, consult a qualified armorer or gunsmith.
Care & Maintenance
Break-in: Follow Fierce or your gunsmith’s preferred break-in routine for match barrels.
Cleaning: Use caliber-correct jags/patches and a quality bore guide; avoid aggressive abrasives.
Thread care: Keep muzzle threads clean; use anti-seize on devices as recommended.
Logbook: Track round count, loads, and cold-bore POI for seasonal consistency.
Specifications (Quick Reference)
Brand: Fierce Firearms
Product: 7mm AR-15 Compatible Barrel
Length: 20"
Platform: AR-15
Part #: 2841820
UPC: 853418284803
Muzzle Threads / Gas System / Twist: Verify for this SKU
Finish: Protective finish (varies by lot)
Frequently Asked Questions
Q: What specific 7mm chamber is this?
A: Verify the exact chambering for part 2841820 (e.g., a 7mm AR-compatible/wildcat). Chamber specs determine bolt face, mags, and ammo.
Q: What’s the thread pitch?
A: 7mm/.30-cal AR barrels often use 5/8x24, but you should confirm the pitch for this barrel before purchasing brakes or suppressor mounts.
Q: Which twist rate does it use?
A: Fast twists are common for long 7mm bullets; confirm the exact twist to match your preferred bullet weights.
Q: What gas system length will I need?
A: Many 20" AR barrels run rifle- or mid-length gas. Verify the gas length and pair with the correct gas tube and buffer system.
Q: Will it work with standard AR-15 uppers?
A: Yes—this is built for AR-15 receivers. Ensure your bolt, mags, and gas/buffer are correct for the specific 7mm cartridge.
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Fierce Firearms 7mm AR-15 barrel, 20-inch precision barrel, AR-15 compatible 7mm build, threaded muzzle for brake/suppressor, high-BC 7mm performance, long-range AR barrel upgrade, part 2841820, UPC 853418284803, verify chamber, gas system, thread pitch, and twist rate.
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Meta Title: Fierce Firearms 7mm, 20" AR-15 Barrel — Threaded | Part 2841820
Meta Description: Build a flat-shooting AR with the Fierce Firearms 7mm, 20" barrel. AR-15 compatible, threaded muzzle, precision-machined for consistent accuracy. Part 2841820 — UPC 853418284803. Verify chamber, gas length, thread pitch, and twist.
From the bench to the backcountry, the Fierce Firearms 7mm, 20" AR-15 barrel gives your rifle ballistic reach, reliable cycling, and true-to-zero consistency—in a package that handles like a carbine and hits like it’s bigger than it looks.
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