The Modular Sniper Rifle, or MSR, is a bolt-action sniper rifle recently
The Modular Sniper Rifle, or MSR, is a bolt-action sniper rifle recently

developed and produced by Remington Arms for the United States Army. It was
developed and produced by Remington Arms for the United States Army. It was

introduced in 2009, and was designed to meet specific United States Army and
introduced in 2009, and was designed to meet specific United States Army and

USSOCOM Precision Sniper Rifle requirements. The MSR won the PSR
USSOCOM Precision Sniper Rifle requirements. The MSR won the PSR

competition, and is called the Remington Mk 21 Precision Sniper Rifle in U.S.
competition, and is called the Remington Mk 21 Precision Sniper Rifle in U.S.

military service. History
military service. History

On 7 March 2013, MSR was declared the winner of the Precision Sniper Rifle
On 7 March 2013, MSR was declared the winner of the Precision Sniper Rifle

competition. Remington announced that the MSR had won on March 8, and it was
competition. Remington announced that the MSR had won on March 8, and it was

publicly confirmed on March 9. This was followed by a $79.7 million contract for
publicly confirmed on March 9. This was followed by a $79.7 million contract for

5,150 rifles with suppressors, along with 4,696,800 rounds of ammunition to
5,150 rifles with suppressors, along with 4,696,800 rounds of ammunition to

be supplied over the next ten years. The contract was awarded on 12 September
be supplied over the next ten years. The contract was awarded on 12 September

2013. Remington Defense produces the sniper rifles and utilizes two other
2013. Remington Defense produces the sniper rifles and utilizes two other

companies for other system components, with Barnes Bullets for ammunition and
companies for other system components, with Barnes Bullets for ammunition and

Advanced Armament Corporation for muzzle brakes and suppressors; all three
Advanced Armament Corporation for muzzle brakes and suppressors; all three

companies are subsidiaries of Freedom Group Incorporated.
companies are subsidiaries of Freedom Group Incorporated.

By 2015, the U.S. Army was considering the PSR to replace both the .300
By 2015, the U.S. Army was considering the PSR to replace both the .300

Winchester Magnum M2010 Enhanced Sniper Rifle and the .50 BMG M107 Long Range
Winchester Magnum M2010 Enhanced Sniper Rifle and the .50 BMG M107 Long Range

Sniper Rifle for regular snipers, although no decision has been made. The
Sniper Rifle for regular snipers, although no decision has been made. The

U.S. Marine Corps was also considering the Mk 21 to replace their M40A5 sniper
U.S. Marine Corps was also considering the Mk 21 to replace their M40A5 sniper

rifle, but is unlikely to adopt the Mk 21 due to the higher cost of the system,
rifle, but is unlikely to adopt the Mk 21 due to the higher cost of the system,

particularly the ammunition, as compared to the 7.62mm NATO M40A5.
particularly the ammunition, as compared to the 7.62mm NATO M40A5.

Design The Remington MSR is a manually operated
Design The Remington MSR is a manually operated

bolt-action weapon with a rotary locking bolt. To facilitate caliber change, the
bolt-action weapon with a rotary locking bolt. To facilitate caliber change, the

bolt is equipped with removable bolt heads, with bolt faces matched for
bolt is equipped with removable bolt heads, with bolt faces matched for

appropriate calibers. Bolt heads have three radial locking lugs. The MSR rifle
appropriate calibers. Bolt heads have three radial locking lugs. The MSR rifle

is built upon an aluminum alloy "chassis", which hosts a compact
is built upon an aluminum alloy "chassis", which hosts a compact

receiver, adjustable trigger unit, pistol grip, and fully adjustable
receiver, adjustable trigger unit, pistol grip, and fully adjustable

side-folding buttstock. The quick-change barrels are free-floated inside the
side-folding buttstock. The quick-change barrels are free-floated inside the

tubular handguard which is provided with a number of user-installable Picatinny
tubular handguard which is provided with a number of user-installable Picatinny

type accessory rails. The top of receiver also is fitted with monolithic
type accessory rails. The top of receiver also is fitted with monolithic

Picatinny rail used to install sighting equipment. Additional equipment includes
Picatinny rail used to install sighting equipment. Additional equipment includes

detachable folding bipod, and a quick-detachable suppressor which
detachable folding bipod, and a quick-detachable suppressor which

installs over the specially designed muzzle brake.
installs over the specially designed muzzle brake.

The model that won the PSR competition is a modified version of the original
The model that won the PSR competition is a modified version of the original

MSR. It can be chambered in 7.62×51mm NATO, .300 Winchester Magnum, and .338
MSR. It can be chambered in 7.62×51mm NATO, .300 Winchester Magnum, and .338

Lapua Magnum. It is reported to have 0.7 MOA average accuracy at 1,000 m with
Lapua Magnum. It is reported to have 0.7 MOA average accuracy at 1,000 m with

both Barnes and ATK 300 gr .338 Lapua Magnum ammunition.
both Barnes and ATK 300 gr .338 Lapua Magnum ammunition.

Changes to the PSR version include: Reinforced AAC muzzle brake for Titan QD
Changes to the PSR version include: Reinforced AAC muzzle brake for Titan QD

suppressor Chromoly steel .338 barrel with 1:9.5
suppressor Chromoly steel .338 barrel with 1:9.5

twist, 5R rifling, and Melonite finish One piece handguard with 20 MOA top rail
twist, 5R rifling, and Melonite finish One piece handguard with 20 MOA top rail

Barrel nut accessible without removing the handguard
Barrel nut accessible without removing the handguard

X-treme trigger Light weight, removable buttstock with
X-treme trigger Light weight, removable buttstock with

throw lever adjustments instead of ratcheting adjustments
throw lever adjustments instead of ratcheting adjustments

On 14 August 2014, the Army announced it was seeking sources to produce .338
On 14 August 2014, the Army announced it was seeking sources to produce .338

Lapua armor piercing ammunition for use in the Mk 21 PSR to effectively engage
Lapua armor piercing ammunition for use in the Mk 21 PSR to effectively engage

targets out to 1,500 m. The main objective is for the rifle to defeat
targets out to 1,500 m. The main objective is for the rifle to defeat

level IV body armor at 400 meters, whether suppressed or unsuppressed, in
level IV body armor at 400 meters, whether suppressed or unsuppressed, in

temperature ranges of −65 to 160 °F. Other minimum requirements include a
temperature ranges of −65 to 160 °F. Other minimum requirements include a

velocity of 1,340 ft/s or more at 1,250 meters, 1,000 ft·lb of kinetic energy at
velocity of 1,340 ft/s or more at 1,250 meters, 1,000 ft·lb of kinetic energy at

1,500 meters, and the ability to defeat both 3⁄8 in of rolled homogeneous armor
1,500 meters, and the ability to defeat both 3⁄8 in of rolled homogeneous armor

and 1⁄2 in of cast iron at 800 meters. Users
and 1⁄2 in of cast iron at 800 meters. Users

United States: USSOCOM, winner of the Precision Sniper Rifle competition.
United States: USSOCOM, winner of the Precision Sniper Rifle competition.

Colombia: Colombian Special Forces. See also
Colombia: Colombian Special Forces. See also

Precision Sniper Rifle References
Precision Sniper Rifle References