I'm not sure what you're expecting but I just turned a homebuilt carbine with a Delton M4(gery) flattop upper over to my older Son a few days ago. Scope sightin showed some pretty good sub 1" groups and a single 3 shot 300 meter group in a 10mph crosswind was under 3". That's pretty darned acceptable for a 16" carbine with a 1.5-5x compact scope.
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