HM Defense RAIDERMC556SBR

The HM Defense RaiderMC556 SBR is a compact 5.56 NATO short-barreled rifle designed for law-enforcement tactical units, patrol deployment, and protective operations. Built around HM Defense’s Monobloc barrel technology and a monolithic upper receiver, the RaiderMC556 emphasizes rigidity, repeatable zero retention, and durability in high-stress operational environments.

This platform is optimized for close-quarters engagements, vehicle operations, and suppressed use, while maintaining compatibility with standard AR-15 accessories and training doctrine.

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Operational Advantages for Law Enforcement

 

• Monolithic upper receiver for enhanced rigidity and optic/laser zero retention

• Patented Monobloc barrel system reduces failure points and improves gas system alignment

• Compact SBR configuration ideal for CQB and vehicle deployment

• Mid-length gas system for smoother recoil impulse and reliable cycling

• Standard AR-15 manual of arms, minimizing retraining requirements

• Suppressor-ready design for tactical and warrant service use

• Integrated rail system supports optics, lights, and aiming lasers

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Barrel System

 

• 12.5″ 4150 chromoly steel barrel

• 5.56 NATO / .223 Remington

• 1:8 twist rate for modern duty ammunition

• Match-grade, button-rifled and honed

• ½×28 threaded muzzle

• Patented Monobloc barrel design with integral gas block

The Monobloc barrel is machined from a single piece, improving durability, alignment, and long-term reliability under sustained training and operational use.

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Monolithic Upper Receiver

 

• Single-piece upper and rail assembly

• Forged 7075-T6 aluminum

• Type III hard-coat anodized finish

• Continuous top rail enhances optic and laser stability

• Reduced potential for rail shift compared to multi-piece designs

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Lower Receiver & Controls

 

• Forged 7075-T6 aluminum lower

• Mil-Spec fire control group

• Standard AR controls for agency familiarity

• QD sling-ready end plate for patrol and tactical sling setups

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Bolt Carrier Group

 

• M16-profile bolt carrier group

• HM Defense patented HMB Bolt, engineered for increased strength and service life

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Furniture & Ergonomics

 

• Adjustable CQB stock, optimized for body armor and vehicle use

• Enhanced ergonomic pistol grip

• Enhanced trigger guard for gloved operation

• Configuration supports long shifts, rapid deployment, and confined-space maneuvering

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Weight & Handling

 

• Unloaded weight: Approximately 6 lbs (configuration dependent)

• Balanced design reduces officer fatigue during extended operations and training

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Suppressor & Tactical Integration

 

• Threaded barrel supports agency-approved suppressors

• Buffer system can be tuned for suppressed or unsuppressed use

• Compatible with weapon-mounted lights, IR lasers, and night-vision systems

• Ideal host for modern LE optics and aiming solutions

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Specifications

 

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Agency Use Case Summary

 

The RaiderMC556 SBR is well-suited for:

• SWAT and tactical response teams

• Patrol rifles for vehicle deployment

• High-risk warrant service

• Protective details

• Urban and CQB-focused operations

• Suppressed mission profiles