I have the mini 14 target with 3x9x50 scope, and a M4 with A2 sight, I love them both. My mini 14 target gets 1" groups @100 meters (don't put too many rounds through in a short amount of time as stainless barrel gets hot bpretty fast.). M4 is a great gun to shoot, but I wouldn't invest a big $$$ scope for it, it defeats the purpose, after all, it is assault rifle, it is great for fast shooting.