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Would like to thank you all for your prompt and icredibly informative replies. This is why I love this forum. You kids all rock.

So, I withstood a long period of denial. Then, as chance would have it, I spent the better part of one day on the interweb. Found myself bitten by the Black Rifle bug. Am now looking to obtain a S&W M&P15MOE. What leads me to launch this inquiry is the incredibly vast arena of optics. Would think of this as a target, coyote hunting, Excrement-Hits-The-Air-Conditioning type of weapon. As far as target acquisition, a red dot scope seems to be the most popular. However, this all seems to circle around the idea of the "co-witness" of the iron sights. I do not understand the importance of this idea. Maybe in low light. Other than that it just seems like an expensive excuse not to practice. I will therefore ask my boardmates for their opinions, comments, gripes, and complaints. Please give me the background to be an old salted dog my the time I get the carbine home. As always, I thank you in advance for your insight.