The 20 inch upper is completely under-appreciated now I feel. Practically speaking, the longer sight radius for irons and soft shooting from the rifle length gas system make the 20 inch extremely pleasurable to shoot, and also extremely accurate. On the practicality side though, I feel that the 18 inch barrel length bridges the gap between the 20 inch and 16 inch extremely well by being relatively easy to handle, and sacrifices very little over a 20 inch barrel when it comes to ballistics.


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