SR-25

SR-25
An SR-25 outfitted with a riflescope, bipod and a detachable suppressor
Type	Designated marksman rifle Semi-automatic sniper rifle
Place of origin	United States
Service history
In service	1990–present
Used by	See Users
Wars	Second Intifada War in Afghanistan (2001–2021) Operation Enduring Freedom - Philippines Iraq War 2006 East Timorese crisis Zamboanga City crisis Battle of Marawi
Production history
Designer	Eugene Stoner
Manufacturer	Knight's Armament Company
Variants	SR-25 Enhanced Match rifle, with 20 in (510 mm) barrel SR-25 Enhanced Match Carbine, with 16 in (410 mm) barrel and M110 flash suppressor MK 11 MOD 0 MK 11 MOD 1 MK 11 MOD 2
Specifications
Mass	Match Rifle 10.75 lb (4.88 kg), LwMatch 9.5 lb (4.3 kg), Carbine 7.5 lb (3.4 kg), Sporter 8.75 lb (3.97 kg)
Length	1,118 mm (44.0 in)
Barrel length	Match Rifle 24 in (610 mm) (also LwMatch & Sporter 20 in or 510 mm, Carbine 16 in or 410 mm)
Cartridge	7.62×51mm NATO
Action	Gas-operated, rotating bolt
Rate of fire	Semi-automatic
Feed system	10- and 20-round detachable SR-25 pattern box magazine

The SR-25 (Stoner Rifle-25)^[1] is a designated marksman rifle and semi-automatic sniper rifle designed by Eugene Stoner and manufactured by Knight's Armament Company.^[1]

The SR-25 uses a rotating bolt and a direct impingement gas system. It is loosely based on Stoner's AR-10, rebuilt in its original 7.62×51mm NATO caliber. Up to 60% of parts of the SR-25 are interchangeable with the AR-15 and M16—everything but the upper and lower receivers, the hammer, the barrel assembly and the bolt carrier group.^[1] SR-25 barrels were originally manufactured by Remington Arms with its 5R (five grooves, right twist) rifling, with twist 1:11.25. The heavy 24-inch (610 mm) barrel is free-floating, so handguards are attached to the front of the receiver and do not touch the barrel.