I'd like to think that the Carbon could take other types of magazines. I wouldn't know why bushmaster, being a very highly respected AR manufacturer, would go out of standard on a 9mm carbine that Colt, and many other's make. That would hurt their reputation in my book. I'll have to look into that further. I don't think there will be problems with the feed ramp, because I think when I looked at the chamber, it was part of the barrel, which is still metal. So I don't think the feed ramp should give any issues by denting or scarring.
As for the Hi point, I've looked at one of those before and was not too impressed. I understand it's more of a plinker rifle. I'd like a little more of a serious type of weapon than that.
I am going back in at lunch to day to look, or if I can't put her down, to buy. I will look at other rifles they have while i'm there to see if something else jumps out at me. A G3 does interest me as well, but i'm afraid the one they have may be too much for my wallet to handle right now. I'm still open to any suggestions/opinions in the meantime.
Thanks to all those who gave me info thus far! I appreciate it!!