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M110 Semi-Automatic Sniper System
M110 ECP Left.jpg
The M110 Semi-Automatic Sniper System
Type Sniper rifle
Place of origin  United States
Service history
In service 2008–present
Wars War in Afghanistan, War in Iraq
Production history
Manufacturer Knight's Armament Company
Weight 6.94 kg (15.3 lb) with scope, bipod, and a loaded 20-round magazine
Length 1,029 mm (40.5 in) (buttstock fully compressed),
1,181 mm (46.5 in) (buttstock fully compressed and suppressor attached)
Barrel length 508 mm (20 in)

Cartridge 7.62x51mm NATO
Action Gas-operated, rotating bolt
Rate of fire Semi-automatic
Muzzle velocity 783 m/s (~2,571 ft/s) with 175gr. M118LR
Effective range 800–1,000 m
Feed system 10 or 20-round detachable box magazine

The M110 Semi-Automatic Sniper System (or M110 SASS) is a semi-automatic rifle that is chambered for the 7.62x51mm NATO round, developed by the American firearm manufacturer Knight's Armament Company.



The M110 SASS rifle with AN/PVS-10 Sniper Night Sight (SNS).

The M110 Semi-Automatic Sniper System is intended to replace the M24 Sniper Weapon System used by snipers, spotters, designated marksman, or squad advanced marksmen in the United States Army. However, the Army still plans on acquiring M24s from Remington until February 2010.[1] The U.S. Army ran a competition involving several designs, including rifles from Knight's Armament Company, Remington, and DPMS Panther Arms. On September 28, 2005, the Knight's Armament Co. rifle won the competition and was selected to be the M110 Semi-Automatic Sniper System. In April 2007, U.S. Army soldiers from Task Force Fury in Afghanistan were the first in a combat zone to receive the M110. The troops rated the weapon extremely highly, noting the quality of the weapon and its semi-automatic capabilities compared to the bolt-action M24.

It is manufactured by Knight's Armament Company in Titusville, Florida, though the complete system incorporates a Leupold 3.5–10× variable power daytime optic, Harris swivel bipod, AN/PVS-14 night sight and PALs magazine pouches of yet unpublished origin. The company name for the rifle is SR-M110 SASS, but the U.S. Army official designation is the M110 SASS. The rifle has ambidextrous features such as a double-sided magazine release, safety selector switch, and bolt catch.

The rifle is similar to the SR-25/Mk 11 Mod 0 semi-automatic precision rifles, but differs significantly in buttstock and rail system design. The SR-25, Mk 11 Mod 0, and M110 are based loosely off the original AR-10 developed by Eugene Stoner but feature additional refinements instituted by KAC to maximize parts commonality with the AR15 / M16, improve weapon reliability, and increase accuracy.

The main differences between the Mk 11 Mod 0 and M110 are:

  • The rail system used: the KAC Free Floated RAS on the Mk 11 is replaced by a URX modular rail system with integral folding front 600 meter back-up iron sight (BUIS).
  • The M110 buttstock: fixed, though the buttplate is adjustable for length of pull to match user preferences. Adjustment can be made without tools via a notched hand-tightened knob on the right-hand side of the stock. This feature was added during the change from XM110 to M110. The fixed buttstock also features integral quick-detachable sling swivel sockets located on each side of the stock near the rear of the lower receiver.
  • The addition of a flash hider to the barrel of the M110, which also necessitates a modified QD Suppressor unit similar to that on the Mk 11 Mod 0.
  • The M110's use of KAC's one-piece 30 mm scope mount instead of two separate scope rings.

Other changes were made when the XM110 made the transition to the M110. Features added were a buttstock hand-tightening knob, sling swivel sockets, a double sided bolt catch, and a button on the folding front sight to allow it to be locked into position.

On June 12, 2008, the M110 was ranked #2 on the U.S. Army's top ten inventions of 2007.[2]

According to performance specification (MIL-PRF-32316 (AR) w/AMENDMENT 1, 5 October 2009): Accuracy. The distance between the mean point of impact of each shot group, both unsuppressed and suppressed, shall be not greater than 1.1 inches at 300 feet. Dispersion. The average mean radius (AMR) (see 6.11), of each shot group shall be not greater than to 0.68 inches at 300 feet. All targets shall be fired on using M118LR ammunition or equivalent, using five (5) round groups.

AMR 0.68 inches for 5 round groups corresponds to 2.34 inches extreme spread for 10 round groups or 2.2 MOA extreme spread for 10 round groups 300 feet.

Sporting Use

In 2009, the M110 rifle and commercial equivalents were added to the list of NRA-legal US service rifles under rule 3.1.6 of the NRA High Power Rifle Rules.[3]


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