So I'm browsing the Rock River website and I see that this is finally available. I'm interested in thoughts on: -Pistol caliber AR carbines, (who owns them, their utility, what do you use them for in your battery)? -Overall impression of Rock River products. Depending upon availability of mags I will likely get this gun. I am a standardization geek and having an AR in .40 caliber to match my Glocks is HIGHLY appealing to me. Thanks for your input. Best, Dave Wanna kill these ads? We can help!