M110A1 Compact Semi-Automatic Sniper System

The M110A1 Compact Semi Automatic Sniper System (M110A1 CSASS) is an American semi-automatic precision rifle that is chambered for the 7.62×51mm NATO round. It is manufactured by Heckler & Koch (H&K) and developed from the company's HK417, and similar to the Bundeswehr G28 configuration. Despite a designation similar to the M110 Semi-Automatic Sniper System (M110 SASS), the M110A1 is a distinct design as the former was a development of the Knight's Armament Company SR-25. The M110A1 is expected to supplant and eventually replace the M110 in U.S. military service. The rifle can also be configured as a Squad Designated Marksman Rifle (SDMR) with a low-power variable optic.

"M110A1" redirects here. For the self-propelled howitzer, see M110 howitzer.
M110A1 Compact Semi-Automatic Sniper System
The M110A1 Squad Designated Marksman Rifle
TypeSniper rifle/Designated Marksman Rifle
Service history
In service2008–present
Production history
Designed2016
ManufacturerHeckler & Koch
Specifications
Mass3.96 kg (8.73 lb) unloaded, 6.94 kg (15.3 lb) loaded with accessories
Length899 mm (35.39 in) (buttstock fully collapsed)
1,009 mm (39.72 in) (buttstock fully retracted)
Barrel length414 mm (16.3 in)
Cartridge7.62×51mm NATO
ActionGas-operated, rotating bolt
Rate of fireSemi-automatic
Muzzle velocity750 m/s (2,461 ft/s) with 175 gr. M118LR
Effective firing range800 metres (875 yd) (point targets)
Feed system10 or 20-round detachable box magazine

Overview

In July 2012, the U.S. Army requested sources to remanufacture the current M110 rifle into the Compact Semi-Automatic Sniper System (CSASS). The CSASS will be a shorter and lighter version of the M110 with a collapsible stock and removable flash suppressor, giving it an overall length of 36 inches (910 mm) and a weight of 9 pounds (4.1 kg) unloaded. The Army wants a capability to convert 125 rifles per month, with the ability to increase to 325 per month.[1] The Army formally requested proposals for the CSASS in June 2014.[2]

On 1 April 2016, the Army announced it had awarded Heckler and Koch a contract with a maximum value of $44.5 million as winner of the competition to replace the KAC M110. The weapon selected was not specified, but was likely the H&K G28; H&K is to produce 3,643 rifles.[3] A goal of the effort was to give snipers a weapon that didn't "stick out" as a sniper rifle; with a suppressor, the M110 is 46.5 in (1,180 mm), 13 in (330 mm) longer than the M4 carbine and 7 in (180 mm) longer than the M16A4 rifle. A minimum of 30 CSASS units will be used for production qualification testing and operational testing over 24 months.[4] H&K later confirmed that a modified G28 had indeed been selected as the CSASS rifle. The G28 is nearly 6 cm (2.5 in) shorter and 1.3 kg (3 lb) lighter than the M110 (unloaded and without a suppressor) and will cost about $12,000 per rifle.[5] In May 2018, the U.S. Marine Corps will begin receiving the CSASS, also to replace the M110.[6]

Design
Main article: Heckler & Koch HK417

The M110A1 is a variant of the HK417 with configuration similar to the German Bundeswehr's G28; the HK417 is a gas piston variant of the AR-10 platform, with the short-stroke gas piston derived from the H&K G36. Compared to the G28, the M110A1 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, Geissele adjustable two-stage trigger, Geissele optic mount, OSS SRM6 suppressor, 6-9 Harris bipod and mount, and a collapsible stock with adjustable comb. In the sniper role, the rifle is equipped with a Schmidt & Bender 3–20×50 PM II Ultra Short telescopic sight.[7][8] When configured as a squad designated marksman rifle (SDMR), the M110A1 mounts a Sig Sauer TANGO6 1–6x24 low power variable optic.[9]

Users

See also

References
  1. US Army looking to replace M14EBR; feelers out for compact M110 – Militarytimes GearScout, July 31, 2012
  2. Army Wants to Buy Compact, Semi-Auto Sniper Rifles – Kitup.Military.com, 13 June 2014
  3. Army picks Heckler & Koch sniper rifle to replace M110 – Armytimes.com, 1 April 2016
  4. Army Selects New Compact Sniper Rifle – Kitup.Military.com, 1 April 2016
  5. Heckler and Koch confirms: This is the Army's new and improved sniper rifle Army Times, 8 April 2016
  6. The Marines just switched their main sniper rifle ― look what's next. Military Times. 9 April 2018.
  7. Nathaniel F. (January 18, 2017). "HK Shows Off the US Army's M110A1 CSASS Compact Sniper Rifle - SHOT 17". The Firearm Blog. Archived from the original on June 1, 2017. Retrieved May 31, 2017.
  8. "SHOT Show 17 – H&K M110A1 CSASS". Soldier Systems Daily. January 23, 2017. Archived from the original on June 24, 2017. Retrieved May 31, 2017.
  9. "Special Operations Snipers Are Getting A New Updated Riflescope". Military Times. 24 January 2019.
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