The M21 sniper weapon system (SWS) in the US Army is a national match grade M14 rifle, selected for accuracy, and renamed the M21 rifle. [7] The M21 uses a commercially procured 3–9× variable power telescopic sight, modified for use with the sniper rifle. [8] It is chambered for the 7.62×51mm NATO cartridge.

M21狙击手武器系统，被称为M21 Sniper Weapon System，简称为M21 SWS，是一支半自动狙击步枪，是在M14自动步枪的基础上改进研制的。M21狙击步枪1969年装备美军部队，越南战争后期成为美国陆军、海军和海军陆战队的通用狙击步枪。

多年来m21经过多次改进，1988年开始被m24 sws取代。 但直到现在， M21 仍在国民警卫队及其他特种作战部队（如海豹突击队等）中使用，而根据美军狙击小组以两人为单位的基本组成，担任 2 号射手的狙击手也常常采用半自动的 M21 来辅助及掩护使用 M24 SWS 或 M82 的 ...

2018年6月16日 · Page details technical specifications, development, and operational history of the Rock Island Arsenal M21 Sniper Weapon System (SWS) Semi-Automatic Sniper Rifle including pictures. The global defense reference actively compiled since 2003

M21狙击手武器系统 （M21 Sniper Weapon System简称：M21 SWS）是一款以M14自动步枪作基础改良而成的半自动狙击步枪。美国陆军从1969年开始装备，1988年开始被M24狙击手武器系统所取代，不过后来有部分M21被重新配发给在阿富汗和伊拉克作战的美军士兵使用。

2017年8月15日 · M21狙击手武器系统（M21 Sniper Weapon System 简称：M21 SWS），是一支半自动狙击步枪，由美国3家单位：美国陆军武器司令部、本宁堡战斗研究司令部、阿伯丁有限战争司令部，与美军射击训练队，在M14自动步枪的基础上改进研制的。

2020年3月31日 · Once the official Sniper program was adopted by the Army in 1988, the M21 was replaced by a new bolt action sniper rifle known as the M24. There are still some M21’s in Army vaults around the country, but none are in wide spread use by the US Army today.

2018年12月23日 · The M21 Sniper Weapon System (SWS) is the semi-automatic sniper rifle version of the M14 rifle. It's chambered for the 7.62×51mm NATO cartridge and 7.62×54mmR for Vietnamese and Chinese modified versions, as well the rare .30-06 version.

2011年7月7日 · It was the primary Army sniper rifle of the Vietnam war and remained standard until replaced by the bolt-action M24 Sniper Weapon System beginning in 1988. The M21 was accurate to 750 yards...

M21 SNIPER WEAPON SYSTEM The National Match M14 rifle (Figure B-1) and its scope makeup the M21 sniper weapon system. The M21 is accurized IAW United States Army Marksmanship Training Unit specifications and has the same basic design and operation as the standard M14 rifle (FM 23-8), except for specially selected and hand-fitted parts. Section I