Quote:
Originally Posted by Soukus
The Ruger SR-556 is just a factory designed and installed piston kit. It still uses the Stoner designed bolt and action with a modified carrier like that of the CMMG kit. So it's really not a new design based on a piston system like the SIG 556.
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You are correct, Ruger has added this capability to a standard AR-15 design. But I am willing to bet the reliability and quality is head and shoulders above a simple kit conversion.
Looking at a Ruger receiver no plastic or nylon bearing surfaces are visable. Ruger does use a seperate piston and operating rod designe along with a easily cleaned and regulated gas cylinder design (all of which does increase the parts count over a stock Stoner system). Not too bad overall.
But for my money, I would agree that the Sig 556 is the better made and designed weapon.