hey guys, I just got into the gun hobby and like many of my other hobbies, i tend to get pretty extreme. within a month my collection (only had guns right now) includes: (2)HK usp40 compact, (1)HK usp45 tactical (ordering a II-a carbon fiber suppressor with it!!!), (1)HK mk23, (2) beretta 92fs, (1) springfield xd-9, and a baby browning...anyways, my friend came back from the military recently and he has a few ar-15's including an olympic, bushmaster and colt preban sporter. My questions is, what is the advantage of owning an ar-15 such as the colt preban over a post ban. i am extremely new to this sport so please excuse my ignorance. my next two purchase will be an mp5k-pdw (if i can find one the way i want!) and an ar-15. i've been trying to read through the stuff in this forum, but there are so many things on here that its kind of hard to search and come up with the specific thing i am looking for. any help is greatly appreciated!!! this is a great site with so much content!!