Remington M24 PSR

Titan QD Suppressor and Schmidt & Bender Scope

Factory marked M24 from Remington Arms

From Wikipedia:

The Remington MSR is a manually operated 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 appropriate calibers. Bolt heads have three radial locking lugs. The MSR rifle is built upon an aluminum alloy "chassis", which hosts a compact receiver, adjustable trigger unit, pistol grip, and fully adjustable side-folding buttstock. The quick-change barrels are free-floated inside the tubular handguard which is provided with a number of user-installable Picatinny type accessory rails. The top of the receiver also is fitted with a monolithic Picatinny rail used to install sighting equipment (telescope sights or night vision sights). Additional equipment includes a detachable folding bipod and a quick-detachable suppressor which installs over the specially designed muzzle brake.

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 Lapua Magnum. It is reported to have 0.7 MOA average accuracy at 1,000 m (1,094 yd) with both Barnes and ATK 300 gr (19.4 g) .338 Lapua Magnum ammunition.

Changes to the PSR version include:

• Reinforced AAC muzzle brake for Titan QD suppressor
  
• Chromoly steel .338 barrel with 1:9.5 twist, 5R rifling, and Melonite (ferritic nitrocarburized) finish
• One piece handguard with 20 MOA top rail
• Barrel nut accessible without removing the handguard
• X-treme trigger
• Light weight, removable buttstock with throw lever adjustments instead of ratcheting adjustments

On 14 August 2014, the Army announced it was seeking sources to produce .338 Lapua armor-piercing (AP) ammunition for use in the Mk 21 PSR to effectively engage targets out to 1,500 m (1,640 yd). The main objective is for the rifle to defeat level IV body armor at 400 meters, whether suppressed or unsuppressed, in temperature ranges of −65 to 160 °F (−54 to 71 °C). Other minimum requirements include a projectile velocity of 1,340 ft/s (410 m/s) or more at 1,250 m (1,367 yd), 1,000 ft⋅lb (1,356 J) of kinetic energy at 1,500 m (1,640 yd), and the ability to defeat both 3⁄8 in (9.5 mm) of rolled homogeneous armor (RHA) and 1⁄2 in (12.7 mm) of cast iron at 800 m (875 yd).