Hi guys, I was looking at some AR videos on youtube and there is a new stock out there for AR carbines with adjustable stocks that slides. This will enable the operator to bump fire or simulate full auto fire, safely and LEGALLY. I looked at some of the blogs and they are just hitting the market and selling at some of the gun shows out West for $250-300+ Pricey yes, but maybe the price will come down soon. Any news on these and where they are available and if any of you have one yet, how do you like it? Thanks!