I just picked up a new RDB-S today and it's such a cute little rifle. I'm loving it but my only complaint is that I couldn't extend the collapsible stock. I saw what I thought would be the stock release (it actually was) but that metal tab wouldn't move. I read the manual and learned that actually was the release and I looked at the exploded diagram to see how the mechanism operates. I verified that I was trying to use it the way it was designed to be used and it was stuck. I figured that something was bound when the RDB-S was "kinetically assembled" at Kel-Tec, or less likely, some rough handling in shipping had caused a problem. I disassembled the RDB-S into the four major assemblies and once apart, the collapsible butt stock repeatedly and reliably worked as it should without difficulty and without binding. I decided to reassemble it with the butt stock extended to prevent any possible binding that might occur during reassembly. After reassembly, the stock release lever was easy to manipulate and the stock could be easily collapsed in what seemed certain to be the way it was designed to work. Problem solved! Only nope. Once collapsed, the stock release once again wouldn't move and the stock was stuck in the collapsed position. Anyone else have this problem? Anyone got a solution? I'll probably disassemble it again and take a better look tomorrow to ensure that all of the relevant parts are there and they're in the correct position.