OK, I have a comparison question, but before I ask it let me preface it by requesting that no one suggest a different alternative. I realize there are other comparable choices (e.g., LMT), but this is what is currently available in my locale. So I want to stick with comparing these two carbines. Thanks. So here is the basic situation: I'm in the market for an above average M4 carbine. I can locate Colt 6920s and S&W M&P15s (with Magpul MOE furniture, which is somewhat of an upgrade). They currently differ in price by $500. Granting that there are some qualitative differences in the Colt (e.g., better barrel steel, M16 BCG), is it worth $500 more for the differences? I'd appreciate any input.