I just read in the book Black Rifle II that when the marines tested the accuracy of the M4 carbine vs. the standard M16, higher scores were acheived with the M4 carbine. It was found that the M4 carbine's better ergonomics contributed to the higher scores. I was going to build a 20" flattop upper for my sporter but after reading this I might go for a 16" FT upper and slap a dot sight on top..


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