This model includes an 11.5-inch carbon steel barrel for durability and accuracy, paired with a 10-inch lightweight handguard that provides plenty of space for mounting accessories while keeping the pistol agile. The flat trigger offers a crisp pull, enhancing control and accuracy for tactical shooting scenarios.

As the world’s most popular rifle, the MR556 A4 is supported by an aftermarket loaded with lots of great accessories, from rails and handguards all the way up to everything you need to make your own legally-registered short-barreled rifle*.

Designed with cutting-edge technology and precision engineering, this rifle sets a new standard for performance, versatility, and user experience. The MCX-SPEAR-LT features a lightened handguard, offering enhanced maneuverability without sacrificing durability.

The XM556 Microgun was designed and engineered around the 5.56mm NATO cartridge. This defensive suppression weapon is significantly smaller and lighter than it's big brother the M134. It was meant to stand in place of anywhere high suppressive fire wanted without the weight or footprint of the larger M134 electrically driven Gatling gun system.

Designed for uncompromising accuracy, durability, and reliability, this semi-automatic pistol is a civilian variation of the legendary HK416, trusted by military forces worldwide. With a cold hammer-forged barrel, a gas piston system for cleaner operation, and enhanced modularity, the MR556 A4 is built to exceed expectations in any environment.

Designed for uncompromising accuracy, durability, and reliability, this semi-automatic pistol is a civilian variation of the legendary HK416, trusted by military forces worldwide. With a cold hammer-forged barrel, a gas piston system for cleaner operation, and enhanced modularity, the MR556 A4 is built to exceed expectations in any environment.

Bronx Park Middle School is a NYC District school located at 2441 Wallace Avenue, Bronx, NY 10467. It serves Grades: 06,07,08,SE.

In April 2022, the U.S. Army selected a new rifle and light machine gun as part of the Next Generation Squad Weapon Program. They will replace 5.56 mm weapons, being chambered in 6.8×51mm Fury that has greater accuracy and range while being more lethal than 5.56×45mm NATO and 7.62×51mm NATO against emerging threats.

The Heckler & Koch MR556 A4 tactical rifle, designed to accept both .223 Remington and 5.56 NATO calibers with a 30-round capacity and an 11" barrel length, is the latest evolution from HK-USA of the iconic HK416. This rifle exemplifies "no compromise" HK performance, merging unparalleled reliability with modern design enhancements.

HK MR556 A4 223 Remington/5.56x45mm, 11" Threaded Barrel, Black, M-Lok Handguard, 10rd. HK Heckler and Koch 81001051. The latest update from HK-USA to the commercial variant of the legendary HK416, the MR556 A4 and MR762 A4 represent an enhanced example of no compromise HK performance. Its short-...