Definition
The M110A1 rifle is a United States military designated marksman rifle (DMR) chambered for the 7.62×51mm NATO cartridge. It is a semi‑automatic, gas‑operated firearm based on the SIG Sauer SIG 716 platform and is intended to provide enhanced precision fire support at the squad level.
Overview
The M110A1 was adopted by the U.S. Army as part of the Squad Designated Marksman Rifle (SDMR) program to replace the earlier M110 Semi‑Automatic Sniper System (M110 SASS) in the designated‑marksman role. The rifle entered service in the late 2010s and has been fielded to infantry units requiring a balance between the firepower of an automatic rifle and the accuracy of a sniper system. It is employed by the U.S. Army, the U.S. Marine Corps, and several allied forces under U.S. security assistance programs.
Etymology/Origin
The designation “M110A1” follows the U.S. Department of Defense nomenclature for small arms, where “M” denotes a model, “110” refers to the original M110 SASS platform, and “A1” indicates a first major modification or variant of that model. The rifle’s design originates from the SIG 716, a civilian market version of the SIG M400 series, which itself is derived from the SIG SG 550 family of rifles developed in Switzerland.
Characteristics
| Feature | Description |
|---|---|
| Action | Direct‑impingement gas system with a short‑stroke piston option (depending on configuration). |
| Caliber | 7.62×51mm NATO. |
| Barrel | 16‑in (406 mm) cold‑hammer‑forged, chrome‑lined barrel with a 1:10 in twist rate, equipped with a free‑floating hand‑guard. |
| Operating System | Semi‑automatic fire only; select‑fire capability is not provided. |
| Stock | Adjustable, folding stock with cheek piece and length‑of‑pull adjustments. |
| Optics | Mil‑spec rail (STANAG 4694) for mounting optics; typical fit includes a variable‑power (e.g., 3‑15×) scope and a backup iron sight. |
| Magazine | Standard 20‑round detachable box magazine; compatible with NATO‑spec 20‑round magazines used in other 7.62 mm systems. |
| Weight | Approximately 8.5 lb (3.9 kg) unloaded, variable with accessories. |
| Accessories | Integrated Picatinny rails for fore‑grip, laser designator, or bipod; often issued with a detachable suppressor and a NATO‑standard tactical sling. |
| Effective Range | 600–800 m for designated‑marksman engagements, with documented accuracy of sub‑1 MOA at 300 m. |
Related Topics
- M110 Semi‑Automatic Sniper System (M110 SASS) – The predecessor DMR system, chambered in 7.62 mm and employed by U.S. special operations forces.
- SIG Sauer SIG 716 – The commercial rifle on which the M110A1 is based.
- Squad Designated Marksman Rifle (SDMR) program – The U.S. Army acquisition effort that selected the M110A1 as its standard DMR.
- 7.62×51mm NATO – The standardized intermediate cartridge used by the rifle.
- Designated Marksman – A military role that bridges the capabilities of standard infantry riflemen and snipers.
- STANAG 4694 – The NATO standard for rail interfaces used on the M110A1.