Mbus rear sight as a primary?
Hey fellas I was just bought a M&P-15 from the local gun shop and it came with a standard A2 fixed front sight. It also came with a Magpul Mbus rear sight and I was wondering if these are any good as a primary sight. I tend to enjoy shooting irons short distances so this is what this gun will be for. If these are crap what irons would you recommend?