The front sight is taller than traditional A2 front sights to account for differences in AR-15 and AR-10 receiver heights.
What does HR stand for?
HR stands for Receiver Height
This definition appears somewhat frequently
See other definitions of HR
Other Resources:
We have 67 other meanings of HR in our Acronym Attic
- Abbreviation Database Surfer
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- House Rule
- Hover Race (game)
- Human Relations
- Human Reliability
- Human Remains
- Human Resources
- Human Rights
- Humanitarian Coordinator
- Hydroxyethylrutoside (also seen as HER)
- Hypersensitive Response
- Rudder Hydraulics
- Human Resource Minimum Obligatory Information Requirement (Australia)
- Human Resouces Strategic Management Plan
- Human Recombinant Cu/Zn Superoxide dismutase (immunology)
- Human Resources & Manpower
- Heat Rejection and Transport
- Hormone Replacement Therapy
- Hungarian Reference Purified Protein Derivative of Tuberculin
- Hazard Ratio for Death
- High Rate Direct Sequence Spread Spectrum (wireless standard)
Samples in periodicals archive:
Briefly, features include: Piston-driving bolt carrier, 3-position gas regulator with receiver height top Picatinny rail, free-floating military-grade chrome-lined barrel, free-floating aluminum quad-rail system with continuous top rail, 7075-T6 Aircraft-grade aluminum upper and lower receiver with hard-coat anodized finish, milled lower receiver with integrated ambidextrous QD sling attachment points, Magpul MOE pistol grip and buttstock, SIG SAUER mini red dot sight, 2-point rifle sling with sling swivels and a 1-piece bolt carrier.
That means that the receiver height is different from the classic antenna height of 2 m, used in the majority of the propagation models, in order to predict the signal strength.