Technical Specifications

Type	Semi-automatic rifle
Country of origin	United States
Manufacturer	Sturm, Ruger & Co.
Designed	2009
Produced	2009–2018
Variants	* SR-556 (standard) * SR-556C (carbine) * SR-556U (6.8 SPC) * SR-556E (essential) * SR-556VT (Varmint/Target) * SR-556TD (Takedown) * SR-762 (7.62/308)
Weight	7.94 lbs
Length	32.75 in (collapsed) · 36 in (extended)
Barrel length	16.12 in
Width	2.5 in
Height	7.75 in
Cartridge	5.56×45mm NATO/.223 Remington · .300 AAC Blackout (Aftermarket barrel) · 6.8mm Remington SPC · .308 Winchester/7.62×51mm NATO (SR-762 only)
Barrel	16 in
Action	Gas-operated short-stroke piston, rotating bolt
Feed	30-round STANAG magazine or 40-round box magazine
Sights	Iron sights
Muzzle velocity	945 m/s
Rate of fire	Cyclic rate of fire: · 800 rounds/min · Practical rate of fire: · Semi-automatic: · 100 rounds/min · Full-automatic: · 250 rounds/min
Range	800 m
Maximum range	1000 m