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Old November 14, 2012, 04:57 PM   #13
TMD
Senior Member
 
Join Date: August 9, 2011
Posts: 482
One nice feature on Rugers SR556 and some other piston driven models is the selectable gas block that allows you to turn it off and make the gun a single shot. Sounds silly unless your running a suppressor then it kind of makes sence.
Now if I could just get my hands on one of Rugers piston systems for my .300 BO
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