Not sure if its because theirs no feedback given so you can't figure out who's a tool and who's a good guy here's a silly experience i'm having when i sell my colt 45 on there I replied this, when this person offered a frakensteined AR for my colt Thanks but not looking for a custom built AR, prefer factory built/assembled. Good luck on the sale and take care- ^^^^really does it look like i'm being a complete a$$? He flips back this in about 3 minutes apparently you haven't been around AR's. The upper is all factory bulit by DPMS. The lower portion is Olympic arms which is also a factory assembled part that allows you to use different barrel configurations and will also allow different calibers if so desired. The fit of everything is probably better than a less exspensive standard version unless it is an original Colt AR. ^^^not really sure how, if you really wanted to trade for something that, you can be so curt about it. This is also after he offered a trade of an AK, then within 9 hours backs out, about 2 weeks before. I mean they're a handful of people Ive came across on this site as well, that would offer everything they have under the sun, then turn around the next day and say deals off, because they had some guy offer $20 extra on top. It is business but a crappy way of doing it..I'm only typing this because this is the one hay strand that broke the camels back, i've wasted my time dealing with people I thought were fine people, to turn out they end up just being low-lifes. Lifes full of them, wish i could weed them out faster and more efficiently.