[QUOTE The S&W on the other hand has a functioning bolt release but looks and feels a bit like an airsoft gun you would find at wal-mart. [/QUOTE]

The Smith&Wesson might feel lite like an airsoft gun, but the Colt IS an airsoft gun. An airsoft gun made to fire .22lr. There is a really good post where a member disassembled the Umarex HK (basically the same thing as the Umarex Colt) and was horrified. He posted pictures
here:M&P 15-22 VS. HK 416-22
I have to admit it looks completely unsafe.
The 15-22 does have a really lite feel to it right out of the box, I won't argue there, but that all goes away once you start putting things on it. It really does have a nice feel to it. And as everyone has been saying it functions and is built like the real thing.