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What does HR stand for?

HR stands for Receiver Height

This definition appears somewhat frequently

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Other Resources:
We have 67 other meanings of HR in our Acronym Attic

Samples in periodicals archive:

The front sight is taller than traditional A2 front sights to account for differences in AR-15 and AR-10 receiver heights.
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.