HM Defense RAIDERM556SBR

The HM Defense RaiderM556 SBR is a compact 5.56 NATO duty rifle engineered to meet the operational needs of law-enforcement tactical teams, patrol deployment, and protective services. Its short-barreled configuration enhances maneuverability in vehicles, hallways, and confined environments while maintaining the reliability and accuracy expected of a modern service weapon.

At the core of the platform is HM Defense’s patented Monobloc barrel system, designed to improve gas system alignment, reduce component failure points, and enhance consistency under hard use.

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Operational Advantages for Law Enforcement

 

• Compact SBR configuration ideal for CQB, vehicle deployment, and urban operations

• Patented Monobloc barrel with integral gas block for improved durability and reduced maintenance

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

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

• Suppressor-ready barrel threading for agencies running suppressed operations

• Modular M-LOK handguard for mission-specific accessories

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Barrel System

 

• 12.5″ 4150 chromoly steel barrel

• 1:8 twist rate for duty ammunition compatibility

• Match-grade, button-rifled and honed

• ½×28 threaded muzzle for flash hiders or suppressors

• Integral gas block machined as part of the barrel (Monobloc design)

The Monobloc system reduces gas system misalignment and improves long-term reliability during high-round-count training and operational use.

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Receivers & Controls

 

• Forged 7075-T6 aluminum upper and lower receivers

• Type III hard-coat anodized finish for duty durability

• Flat-top Picatinny upper for optics mounting

• Mil-Spec fire control group and controls for familiarity and ease of maintenance

• QD sling-ready end plate for patrol or tactical sling configurations

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Bolt Carrier Group

 

• M16-profile bolt carrier group

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

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Handguard & Accessory Mounting

 

• Free-float aluminum handguard

• Full-length top Picatinny rail

• M-LOK mounting surfaces for lights, lasers, grips, and barricade stops

• Optimized length to support weapon-mounted lights and IR devices

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Furniture

 

• Adjustable CQB stock for body armor and vehicle use

• Enhanced ergonomic pistol grip

• Enhanced trigger guard for gloved operation

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Weight & Handling

 

• Unloaded weight: Approximately 5 lb 11.5 oz

• Lightweight, balanced design reduces officer fatigue during extended operations and training days

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Suppressor & Team Integration

 

• Compatible with agency-approved suppressors

• Buffer tuning can be configured based on suppressor selection and duty ammunition

• Supports night vision and laser aiming devices commonly used by SWAT and tactical units

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Specifications

 

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Agency Use Case Summary

 

The HM Defense RaiderM556 SBR is well-suited for:

• SWAT and tactical teams

• Patrol rifles for vehicle deployment

• Protective details

• Urban and CQB-focused operations

• Suppressed mission profiles