Quote Originally Posted by BoilerUp View Post
I see. You're thinking more PDW than "truck gun". The 300 AAC will definitely give you more juice, so an MCX/JAKL is reasonable. Below is a picture of a 5.5" 300ACC "PDW" pistol build next to an MP5K (PRT9K) to show how close you can get.

But PCC / 9mm PDWs are fun, too. Have you considered the new Kuna? Or, perhaps an MP5K?

On that Aero build, how long is that hand guard? I looked at their website and it seems like the shortest ones they offer are 7.5".