The HK MR762 A4 16.5″ is the standard-length 7.62 x 51 mm rifle configuration in the MR A4 family. Its caliber, receiver dimensions and model-specific components distinguish it from MR556 configurations. This page is a neutral identification and specification reference.
MR762 A4 16.5″ specifications and reference details
- Caliber: 7.62 x 51 mm
- Overall length: 35.5–39.5 in.
- Overall height: 7.75 in.
- Overall width: 3.23 in.
- Barrel length: 16.5 in.
- Reference weight: 8.8 lb without magazine
- Magazine capacity: 10 or 20 rounds, depending on magazine and package
- Barrel profile and twist: Four lands and grooves; 1-in-11-inch right-hand twist
Specifications and package contents may vary by market and production period. Confirm the factory ID and current documentation on the official HK MR762 A4 16.5″ reference page.
Model variants and MR family
Related products include MR556 A4 16.5″, MR556 A4 SBR, and MR762 A4 16.5″. Similar external styling does not establish caliber, receiver, magazine or component compatibility. Confirm whether a listing represents a complete firearm, an upper receiver kit, a pistol configuration or an NFA-regulated short-barreled rifle.
Browse the MR Series, return to the Rifles reference category, or review compatible components through Rifle Parts.
Identification considerations
Check the complete model designation, caliber marking, barrel-length description, serial-number records, receiver markings and packaging label. Do not determine configuration or legal classification from photographs alone.
Compatibility information
MR556 and MR762 magazines, bolts, barrels, buffers, handguards and other components are not universally interchangeable. Compatibility can depend on caliber, model generation, barrel length, receiver specification and manufacturer part number. Confirm every component with current HK documentation or a qualified professional.
Safety, lawful transfer and professional service
Treat every firearm as loaded, keep it pointed in a safe direction, keep your finger away from the trigger until ready to fire, and follow the current operator manual. Possession, transfer, transport, configuration and storage must comply with applicable law. Inspection, repair and component installation should be performed by HK or a qualified firearms professional.
Common MR762 A4 16.5″ questions
How should this configuration be identified?
Use the full model designation, caliber, barrel length, receiver markings and factory ID rather than appearance alone.
Are MR556 and MR762 components interchangeable?
No. They use different calibers and model-specific assemblies. Verify each manufacturer part number.
Where can current specifications be confirmed?
Use HK’s current product page and operator manual for the exact model and factory package.
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