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The 5.56 mm x 45 Heckler & Koch HK416 is a short-stroke M4/M16-type semi-automatic developed around a short 20.0” steel barrel to meet Special Forces usage. The gun piston-driven self-adjusting gas operated instead of using the M4 and M16-type gas impingement operating system. It takes many AR-15 characteristics and other upgrades, so it’s no longer an AR-15.

The all-black HK416 is an accurate, sturdy and reliable workhorse. It started with the G36’s HK-proprietary gas piston system. This system’s beauty is it vents propellant gases and carbon fouling out instead of back into the weapon’s interior. Thus, it fires longer and more reliably, and there’s less cleaning to boot.

Furthermore, various parts and processes have been over-engineered for rugged long-term durability. The lower receiver has been redesigned for ambidextrous configuration. Consequently, the magazine release, charging handle, bolt catch and safety/fire selector can be used by either left handers or right handers. The HK416 also has a firing pin safety.

Key dimensions include its short 20.0” cold hammer forged barrel. Height is 9.45”, width 3.07” and overall length is 37.05”. The empty weight without magazine is 8.48 pounds. Add an empty magazine and weight just crosses 9.0 pounds. Speaking of which, magazines are either 20-round or 30-round.

The gun has diopter retractable sights. The sight radius between them is 14.61”.

Beyond the 20” barrel, other barrel options include 10.4”, 14.5” and 16.5” lengths.

There are two free-floating handguard choices, both designed and made by HK. The modular rail system (MRS) works with the OSS suppressor system. The octagonal cross-section MRS uses HKey Mod slots in all directions except on top where it has a long Picatinny rail. The MRS is 14.7” long, all black, and includes two rail segment sections to attach to any HKey Mod slots.

The other system is HK’s long anodized black free-floating rail system (FFRS). This aluminum handguard has Picatinny rails at 3, 6, 9 and, of course, 12 o’clock.

“OTB” models have “over the beach” functionality that allows them the fire after being in water without yet being fully drained.

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