The Heckler & Koch HK417 is a battle rifle and designated marksman rifle. It is designed and manufactured by Heckler & Koch in Germany. Being the larger caliber version of the Heckler & Koch HK416, and chambered for the 7.62×51mm NATO rifle cartridge, it is intended for use where the penetrative power, stopping power, and range of the 5.56×45mm NATO HK416 would otherwise be insufficient. The HK417 is gas-operated, has a rotating bolt and is capable of selective fire. The HK417 has been adopted for service by a number of armed forces, special forces, and police organizations throughout the world, including the Bundeswehr, United States Joint Special Operations Command, the United States Army, Russian Spetsnaz forces such as FSB Alpha Group, and others.
The HK417 is similar in internal design to the HK416, although the receiver and working parts are enlarged to suit the larger 7.62×51mm cartridge. The bolt is a seven-lug rotating type, which sits in a bolt carrier and operates in a forged alloy receiver resembling those of the Stoner-designed AR-10, AR-15 and M16 rifles. Like the HK416, the HK417 is gas-operated with a short-stroke piston design similar to that of the Heckler & Koch G36. The short-stroke piston may be more reliable than the original direct impingement operation of the AR-15 design because, unlike these weapons, it does not vent propellant gases directly into the receiver, which deposits carbon fouling onto the bolt mechanism as well as heating it up. The early HK417 prototype used 20-round magazines from the Heckler & Koch G3 rifle family, which did not feature a bolt hold-open device. Later prototypes, however, switched to a polymer magazine with bolt hold-open. The magazine resembles an enlarged version of the G36's transparent magazine, except without the pins for holding more than one magazine together.
Carbine with 304.8 mm (12 in) standard barrel
"Recon" rifle with 406.4 mm (16 in) standard or accurized barrel
"full size" rifle with 508.0 mm (20 in) accurized barrel
In April 2016 Heckler & Koch confirmed that a lighter version of the G28 had won the United States Army's Compact Semi-Automatic Sniper System contract to replace the M110 Semi-Automatic Sniper System. It is designated as the M110A1 and uses an aluminum upper receiver instead of steel to meet weight requirements, weighing 8.4 lb (3.8 kg) unloaded and reaching some 15 lb (6.8 kg) loaded and with accessories; the M110A1 features a Geissele M-LOK rail handguard, Schmidt & Bender 3–20×50 PM II Ultra Short telescopic sight, Geissele optic mount, OSS SRM6 suppressor, 6-9 Harris bipod and mount, and a collapsible stock with adjustable comb. In May 2018, the U.S. Marine Corps will begin receiving the CSASS, also to replace the M110. In March 2018, the Army announced that a version of the G28E-110 would be issued to infantry squads as the service's standard Squad Designated Marksman Rifle (SDMR). It has been designated as the M110E1. Issuing a 7.62×51mm NATO SDMR is meant to increase individual squads' ability to defeat enemy body armor that standard 5.56×45mm NATO rounds cannot penetrate. The M110E1 will replace the M14 EBR, in use by the Army since 2009, but because it was based on an operational needs statement it had to be turned in by units at the end of a combat deployment. Unlike the sniper configuration, the SDMR model will be equipped with a different buttstock and barrel twist than the CSASS model. The marksman version is fitted with a simpler SIG TANGO6 1-6×24 telescopic sight to make quick adjustments between 0–600 m (0–656 yd), and it fires M80A1 Enhanced Performance Rounds or XM1158 Advanced Armor Piercing Rounds rather than sniper rounds; it will be fielded with a suppressor to make the marksman less identifiable with louder 7.62×51mm NATO rounds. The SDMR TANGO6 1-6×24 telescopic sight features a red horseshoe dot for fast aiming and an illuminated Extended Range Bullet Drop Compensation (BDC) illuminated front focal plane reticle. Roughly 6,000 are planned to be fielded with one per squad in infantry, engineer and scout formations. U.S. Army combat units began receiving the first M110E1 SDMRs in April 2020. Fielding to all close combat squads is expected to be completed in late 2023.
The HK417A2 is an improved version. The design of the receiver, barrel interface, gas port and the bore axis alignment of the rifle have been further optimized to increase its accuracy and reliability.
Carbine with 330.2 mm (13 in) barrel
Rifle with 419.1 mm (16.5 in) barrel
"full size" rifle with 508.0 mm (20 in) barrel
After using the HK417 as a stopgap designated marksman rifle under the G27 designation, the civilian MR308 was used to develop the G28, a designated marksman rifle for the German Bundeswehr (Federal Army) deployment to the War in Afghanistan. The semi-automatic G28 is chambered for 7.62×51mm NATO and has a factory warrantied accuracy of 45 mm dispersion at 100 meters (0.45 mil or 1.5 moa) when fired with 10 rounds using OTM/HPBT/Sierra Match King ammunition. The G28 features STANAG 4694 NATO Accessory Rails that are backwards-compatible with the STANAG 2324/MIL-STD-1913 Picatinny rails. The upper receiver is made from steel instead of HK's aluminium alloy. Approximately 75% of the parts are interchangeable with the HK417. There are two different versions of the G28: G28 E2 (Standard) with a Schmidt & Bender 3–20×50 PM II (modified to Bundeswehr requirements) and the G28 E3 (Patrol) with Schmidt & Bender 1–8×24 PM II. By October 2017, Heckler & Koch had renamed the G28 as the HK241, though G28 remains its Bundeswehr designation.
Special Operations Battalion - HK417.
Jagdkommando - HK417P.
Australian Army acquired 16″ 'Recce' variants paired with 6× ACOG for a designated marksman solution for use in Afghanistan.
🇧🇷 Brazil Brazilian
Army and Federal Police of Brazil.
🇨🇿 Czech Republic
601st Special Forces Group.
Royal Danish Army - 20″ "Sniper'"as a designated marksman rifle. Set to be replaced by the Colt Canada C20 DMR in the first quarter of 2021.
Estonian Special Operations Force uses it as a designated marksman rifle.
Commandement des Opérations Spéciales (COS) and the regular French army as a DMR, it is also used by various police units and the gendarmerie.
German Army uses the HK417 - 16″ as the G27.
German Army uses the HK417A2 - 13″ as the G27K.
German Army uses a modified MR308, the G28, as a designated marksman rifle.
GSG 9 sniper teams of the German Federal Police - G28.
Jala Mangkarta Detachment use the G28 as a Designated Marksman Rifle.
Ireland Defence Forces Army Ranger Wing sniper teams.
Japan Ground Self-Defense Force, Special Forces Group (Japan).
Pasukan Khas Laut sniper teams of the Royal Malaysian Navy.
Korps Commandotroepen (KCT) of the Royal Netherlands Army acquired the 16″ 'Recce' paired with Aimpoint CompM2 or Schmidt & Bender 3–12×50 PM II.
Norwegian Armed Forces uses it as a sharpshooter and designated marksman rifle HK417N
Special Actions Detachment of the Portuguese Navy - HK417, G28.
Special Operations Troops Centre of the Portuguese Army - HK417, G28.
Special Operations Intervention Group (GIOE) of the National Republican Guard - HK417, G28.
Tactical Actions Group (GAT) of the Maritime Police - G28.
Spetsnaz snipers of law enforcement agencies - MR308.
FSB Alpha Group -
Slovenian Special Police Unit (Specialna Enota Policije) HK417.
🇬🇧 United Kingdom
Special Air Service - HK417 (L2A1) - 12", 16" and 20".
🇺🇸 United States
Joint Special Operations Command United States Army - M110A1.
United States Air Force - M110A1 as SDMR.
National Navy of Uruguay, Marine infantry - HK G28 .