Length (stock extended)
Length (stock collapsed)
Cyclic rate of fire
700 - 850 rpm
Range of effective fire
A HK416D is
a modified variant of a Heckler & Koch
HK416 assault rifle. It was
introduced in 2010. In turn the HK416 is an improved version of the
carbine, that is widely used by the US military. The HK416D has been
adopted by the US Marine corps as the M27 in 2011.
Marines initially ordered 4 748 rifled and planned to obtain a total
of 6 500 of these automatic weapons. These partially replaced
the M249 Squad Automatic Weapon, that was adopted back in 1985. The main
goal adopting the M27 was to enhance automatic rifleman's
maneuverability, especially in urban terrain. However the M249 will
remain in service with the US Marine Corps. The new weapon is
distributed one per 4-men fireteam.
In terms of
and ergonomics the M27 is very similar to the
and M4A1 and has a familiar feel for soldiers, reducing the time
needed for retraining. However the German Heckler & Koch company
successfully improved this weapon and cured a lot of its problems.
The M27 is a gas-operated automatic weapon. It is chambered for a
standard NATO 5.56x45 mm ammunition. It uses a patented gas
piston system, derived from the
& Koch G36 assault rifle. This new operating system
significantly reduced malfunctions and increased life of parts,
comparing with the M16A4 assault rifle. The new weapon is much more
The M27 has
a 419 mm (16.5 in) barrel. The barrel is cold hammer-forged and has
a 20 000 round service life.
handle is ambidextrous. Fire mode selector has three positions for
"safe", "semi-auto" and "full-auto".
rifle is fed from 30-round magazines. At the start of testing this
automatic rifle used 100 round magazines, however these were
unreliable. It is compatible with all standard NATO 5.56 mm
magazines. However the M27 was criticized for its low magazine
capacity, as it replaced the belt-fed 200 round suppressive fire
weapon. Even though the M27 is more reliable and more accurate, it
looses in terms of firepower to the
M249. This magazine-fed rifle
has to reload more often and is not able of sustaining fire. The
gunner of the M27 is expected to carry a total of 16 to 22
magazines, depending on mission requirements. While the gunner of
the M16A4 typically carries only 7 magazines.
Weapon has a
telescopic buttstock, that can be extended or collapsed to suit the
The M27 has
a Picatinny-type scope rail and can be used with various scopes. It
comes as standard with Trijicon 3.5x magnification day sight. There
is a reflex sight on top for close-quarters engagement. Also there
are flip-up diopter sight and front post for emergency use. The M27
has effective range of 550 m against point targets and 800 m against
accessory rails on all four sides of the forearm. The M27 is
compatible with most current accessories for the
including a 40-mm underbarrel grenade launcher. Also the M27 is
often used with detachable bipod and laser pointer.