MX556 Gen 2 AR15 Rifle – 5.56 NATO, 4150 CMV Nitride Barrel, Mid-Length Gas, RG2 Wedge Lock Rail, Microbest Chrome BCG, Elftmann Trigger

MX556 Gen 2 Rifle – 5.56 NATO | Mid-Length Gas | Precision-Built Performance

The MX556 Gen 2 Rifle represents the next level of AR15 performance—engineered with elite-grade components, tuned for reliability, and precision assembled by experienced builders.

Founded by engineers and building rifles since 2014, Mid State Firearms approaches every platform with a focus on mechanical efficiency, proper tolerances, and real-world performance—not just parts selection.

This is a fully realized system, built to run under pressure and perform without compromise.

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Purpose-Built Performance – Component by Component

4150 CMV Nitride Barrel – 1/7 Twist | Mid-Length Gas System

• 4150 Chrome Moly Vanadium steel for superior strength and heat resistance
• Black nitride finish for increased wear life and corrosion resistance
• Mid-length gas system for smoother recoil and reduced component wear
• M4 feed ramps for reliable feeding under all conditions
• 1/7 twist stabilizes a wide range of modern bullet weights

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RG2 Rugged Rail – Wedge Lock System

• True free-float M-LOK rail for enhanced accuracy
• Wedge lock system provides exceptional rigidity and zero shift
• Built for hard-use applications and accessory mounting without compromise

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Microbest Chrome BCG – Fully Upgraded & Duty-Ready

• C158 Carpenter steel bolt (true mil-spec material)
• Individually HPT/MPI tested (not batch tested)
• Hard chrome carrier for reduced friction and easier cleaning
• Sprinco extractor and ejector springs for improved reliability
• Permatex-sealed gas key (mil-spec sealing method)
• OCKS gas key screws for superior long-term retention

This is a serious-use BCG, designed to outperform standard mil-spec options in both durability and consistency.

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Elftmann Competition Adjustable Trigger

• Crisp, clean break with minimal creep
• Adjustable pull weight
• Fast reset for precision and speed

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Gas System & Reliability Enhancements

• .750 steel low-profile gas block for durability and consistent gas delivery
• Stainless steel gas tube for corrosion resistance and long service life

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Upper Receiver – True Mil-Spec Foundation

• 7075-T6 aluminum construction
• Type III hardcoat anodized finish
• M4 feed ramps
• Forward assist and dust cover installed

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Furniture & Ergonomics

• Rogers Super Stock – lightweight, stable, and secure lockup
• Magpul K2+ Grip – improved angle and enhanced control with rubber overmold

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3-Prong Closed Tine Flash Hider

• Reduces flash signature in low-light conditions
• Closed tine design minimizes snagging
• Durable and suppressor-conscious configuration

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Why Choose the MX556 Gen 2 Over Competitors?

In a market filled with well-known names, the MX556 Gen 2 is built for those who look beyond branding and focus on what actually matters inside the rifle.

Built by Engineers – Not Just Assembled on a Line

Large manufacturers prioritize volume. We prioritize precision, fitment, and function. Every rifle is assembled with attention to gas system balance, torque specs, and component interaction.

Higher-End Components Where It Counts

Many rifles in this price range still use:

• Batch-tested bolts
• Standard extractor springs
• Basic gas key hardware

The MX556 Gen 2 upgrades critical failure points with:

• Individually tested C158 bolts
• Sprinco spring upgrades
• OCKS fasteners and sealed gas key

These are the details that impact long-term reliability—not just spec sheets.

Better Shooting Characteristics Out of the Box

The mid-length gas system, properly tuned assembly, and premium trigger combine to deliver:

• Smoother recoil impulse
• Faster follow-up shots
• Improved consistency

No need to “fix” the rifle after purchase.

True Value

Instead of paying for brand name alone, you’re getting:

• Premium internal components
• Enhanced durability upgrades
• Careful, experienced assembly

All in a rifle designed to run hard and last.

Proven Experience Since 2014

Mid State Firearms has been building AR platforms for over a decade, with a foundation rooted in engineering principles and real-world use—not trends or shortcuts.

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Built by Professionals – Ready for Anything

Every MX556 Gen 2 rifle is:

• Properly torqued and assembled
• Gas system aligned and verified
• Function tested and inspected

The result is a rifle that delivers confidence from the first round to the last.

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Key Specifications

• Caliber: 5.56 NATO
• Barrel: 4150 CMV, Black Nitride, 1/7 Twist
• Gas System: Mid-Length
• Gas Block: .750 Steel Low Profile
• Gas Tube: Stainless Steel
• Handguard: RG2 Rugged Rail with Wedge Lock
• Upper Receiver: 7075-T6, Type III Anodized
• Bolt Carrier Group: Microbest Chrome (C158, HPT/MPI, Sprinco, OCKS, Permatex Seal)
• Trigger: Elftmann Adjustable Competition Trigger
• Stock: Rogers Super Stock
• Grip: Magpul K2+
• Muzzle Device: 3-Prong Closed Tine Flash Hider

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The Bottom Line

The MX556 Gen 2 is built for shooters who understand that performance is earned through component quality, engineering, and proper assembly—not shortcuts.

If you’re investing in a rifle to last, this is the platform that delivers where it actually counts.