The 6940 is a great rifle, but it offers you fewer options for modifications down the road because of the monolithic upper. Me, I like a longer rail; on the 6920 I could easily install a long free-float rail. But on the 6940 I'm stuck with the shorter rail because it's a permanent part of the upper receiver.
The 6940 has several advantages to the 6920: The monolithic rail is simpler and more sturdy and makes it easier to mount a scope using normal rings. It has a great rear flip-up sight made by Maytec (it's a better sight if you're using it as a primary, in my opinion. The Magpul rear sight on the 6920 is better as a back-up). It also comes with a flip-up front sight and is offered in a gas piston system if that's your thing.
But I prefer the 6920 because it's a traditional design with more customization options due to the standard-configuration upper receiver.
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0331: "Accuracy by volume."
Last edited by Theohazard; July 6, 2013 at 11:03 PM.
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