Product Review: Rock River Arms PDS Piston Driven Carbine
The PDS is Rock River Arms’ entry into the piston AR market. I’ve never been enthusiastic about this concept, but Rock River Arms (RRA) put some serious design thought into this weapon, and the results are impressive. Here are some pictures. Starting at the rear, it has a side-folding stock, because the recoil system isn’t in a receiver extension inside it. This is a significant advantage for transport and carry. The folder mechanism does take a bit of getting used to. It requires lifting the stock out of a deep detent. It locks solidly in place open or closed, and …