I at long last received my Rock River Arms PDS Piston Driven System pistol through my favorite local area transfer dealer. I have been saving my weapon dollars for about a year or so since it was unveiled in early 2010. I haven't had a opportunity to shoot the PDS yet, but I've recently been amassing some accessories for the PDS pistol while I was saving my dollars. Here are the features when delivered through my web based http://www.class3weapons.com/Rock_River_Arms_s/1.htm from Rock River Arms

Caliber: Rem .223/ 5.56 NATO for 5.56mm & .223 cal.
Upper Receiver: Proprietary, with Extended Top Rail
Charging Handle: Proprietary Ambidextrous Non-Reciprocating
Barrel: 8" Chrome Moly, 1:9 twist
Muzzle Device: A2 Flashhider/ 1/2-28 Threads Per Inch
Trigger: Rock River Arms NM 2 Stage
Grip: Hogue Rubber Pistol Grip
Handguard: Injection molded, Ribbed
Magazine: 30 Round
Weight: five pounds
Overall Length: 17.5 in .

The RRA Piston Driven System Pistol has a retail cost of $1385.. I wound up obtaining it online for significantly less. Most dealers in my area wanted retail plus which did not set well with my spending budget. Once I get to the shooting range I am going to have some follow up information on accuracy and what ammo I am using. I forgot to say, the accessories I purchased was a Veridian green dot to mount on the rail just forward of the handguard and a Eotech 552. I don't know which kind of sight I will go with yet. Whichever way I go, green laser or red dot, it will not be wasted because I have a couple of RRA Rifles in the safe that I'd love to try either on. I'm off and away to the shooting range….