I have always wanted to SBR a Glock 17 and put a stock on it. I thought about doing this years ago. I would also add a suppressor, and maybe a red dot on it, and feeding it with 33rd mags.
I kind of went away from this idea, and started thinking about a 9mm AR-15 SBR. I would also add a can to this, and run it with a red dot.
One of the issues that has delayed this purchase, is that I'm not sure which AR platform to go with in 9mm (Colt, etc...) Which magazine is best? Are they easy to find? Are they inexpensive?
I hate adding another platform, logistically. I have pared my collection of magazine fed rifles down to rifles that are chambered in 5.56 and feed from AR mags, or 7.62x39 and feed from AK mags. I don't mix this up. My pistols are mostly 9mm Glocks (26/17), .45 Glock (30/21), and .45 1911s. The only exceptions are pocket pistols and revolvers, as I don't stockpile a bunch of mags for those.
I am seriously considering the CAA RONI G2-9 to fit the requirements I have. It will give me a 9mm SBR. It can be fired with my AAC Ti-Rant 9mm attached to the Glock 17 host. It can easily be fitted with a red dot optic without gunsmithing the slide of the G17. It doesn't add a new magazine type to keep up with. I already have Glock 33rd mags for 9mm.
The downside is that it won't be as accurate as an AR in 9mm (I can't imagine the Roni chassis can achieve a high degree of accuracy with the optic mounted to the chassis). If I'm wrong about this, then all the better. However, what kind of accuracy do you need in a 9mm SBR? I think the advantage will be combat accuracy in a platform that can be fired MUCH faster than a pistol. I imagine hitting 25yd targets very fast with this, vs. the slow-fire I would require with just a pistol. However, I wouldn't scope this and shoot it slow-fire at 100yds for groups.
This is what I'm looking at.
The front muzzle piece comes out somehow, and it can accept a suppressor up to 35.5mm in diameter. My Ti-Rant is 35.0mm. This is what it will look like with the suppressor.
So, I think this kit would be a great solution for what I'm looking for. It's not cheap, but neither is getting a 9mm AR and all new magazines.