I'd like to say thanks to Rob for doing putting this list together. You can look at the list as a 'who offers what for how much' list. So depending on your criteria for a M4(ish) gun, you can find a manufacturer that has what you want and look at overall value of what you are getting. There is great value in being able to do this.
I don't see why people assume that this is a 'which is best' list. It is only listing desirable features and who offers what.
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