I own a gunstore, and I'm a Rock River dealer. Let me give you a peek behind the curtain.
Rock River has a 6-8 week backlog. That means that if I order a gun tomorrow, it is going to take 6-8 weeks before it shows up. No matter how bad I want it right now. RRA is popular.
I sell a lot of RRA guns, and I seldom have any in stock. Why? Because I tend to sell them as fast as I get them in. My last unclaimed Entry Tactical sat on the shelf for two days.
Nobody answers the phone on Saturday. So you would have to wait until Monday.
Why no service rifles? Why lots of M4 types? Because I can't sell a carry handled gun anymore. I've got a screaming deal on a Colt HBAR and a Armalite NM rifle, and they've sat here for months. Nobody wants service rifle guns in my region, so I don't normally order new ones that can also sit here.
Gun dealers have to roll the dice and take a gamble on what to stock. Every single gun you see on that wall cost money to get there. Dealers have to guess what to stock, because every dime spent on something that doesn't sell is a dime that could have been spent on something that will sell. The problem is figuring out what that is going to be.