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Ruger AC-556 vs SIG SG 551
Side-by-side technical comparison
Ruger AC-556
RiflesDiscontinued
SIG SG 551
RiflesDiscontinued
Overview
Spec
Ruger AC-556
SIG SG 551
Production
1982–1994
1990–present
Units produced
Approximately 5,000
Approximately 30,000
Specifications
Spec
Ruger AC-556
SIG SG 551
Overall length
946 mm
833 mm (stock extended)
Barrel length
330 mm
363 mm
Weight
3.06 kg
3.20 kg
Magazine capacity
20 rounds
30 rounds
Action type
Gas-operated, rotating bolt
Gas-operated, rotating bolt
Trigger type
Selective fire
Selective fire
Sights
Adjustable front post, aperture rear
Diopter rear, post front
Calibers
Ruger AC-556
SIG SG 551