I am looking at building an SBR, but I'm conflicted. I cannot decide if I want to just go the AR route (it's easy to buy the upper and slap it on a lower) or if I want to run an AK. I love AK's but, as of recently, I am very interested in AR's as well, especially with the .300 AAC Blackout or the .50 Beowolf or .458 SOCOM, or any of the many other calibers. If I go the AK route, it will be a 7.62x39 with a 10" barrel, unless I can find one shorter, and have a wire folding stock that I am thinking I may design and build myself. Additionally, I am probably going to suppress the rifle after I get the SBR stamp on it, whether it's AK or AR. And yes, I know that the AR offers calibers that are better for suppression. Now, if I go the other way and get an AR SBR, I will be running a 5-10" upper on a spikes lower. I am unsure of what caliber to go with, but I am really leaning .300 AAC because I can suppress it and make it really quiet compared to 5.56 or 7.62x39. But I'm still not sure if I want to go this route. Opinions would be greatly appreciated.