Pretty much the same as I what I will be doing. I will run 5.56 and 22. I have a 22 dedicated Spikes upper as well as the CMMG 22 conversion also, along with the parts to run full auto. Given the cost these days, I doubt I will get a another full auto. M16 was really my only choice given its versatility and the ability to run my current uppers. I was looking at the HK53, but I would alway still yearn for a M16, so why bother with the HK. The Uzi does look fun too though.