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IA Iron River Armory

HK MR762 A4 7.62×51 16.5in 20rd M-LOK Black

SKUCSSI|HZ81000829 Conditionnew CategoryAR Rifles
$4434.53
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Specs at a glance

HK MR762 A4 7.62×51 16.5in … SPECS AT A GLANCE 9.84 lbs WEIGHT 16.5 inches SIZE
Editorial diagram — measurements verified during testing.

About this product

The Heckler & Koch MR762 A4 is a purpose-built modern sporting rifle intended for reliable semi-automatic operation in 7.62×51 NATO. It combines HK’s short-stroke gas piston system with an adjustable gas regulator for tailored suppressed or unsuppressed operation. The A4 configuration features a slim M-LOK handguard, a threaded 16.5 inch barrel, and fully ambidextrous controls. The platform is supplied with a 20-round detachable magazine and a six-position synthetic stock for adaptable ergonomics.

Key Specifications

  • The caliber is 7.62×51 NATO (.308).
  • The barrel measures 16.5 inches and is threaded.
  • The rifle ships with a 20-round detachable magazine.
  • The action is semi-automatic utilizing a short-stroke gas piston.
  • The overall length is 39.5 inches with the stock in its standard position.
  • The listed weight is 9.84 lbs.
  • The stock is a 6-position synthetic collapsible/folding design.
  • The handguard is a slimline M-LOK layout for accessory mounting.
  • The receiver features a fully ambidextrous lower and controls.
  • The muzzle thread pattern is 5/8×24.

Built to provide durable, consistent performance, the MR762 A4 balances proven HK engineering with usable features for range use, precision practice, and general-purpose modern sporting applications. Its piston system reduces fouling in the action and the modular M-LOK handguard and adjustable stock let users configure the rifle to their preferred setup.

Sources & methodology. Editorial review and rating by Travis Caldwell based on hands-on testing notes and published vendor specifications. Pricing verified at time of publication.
$4434.53