I'm a do-it-yourself kinda guy.  I thought the shotgun was already pre-tapped but it wasn't.  So I had to take it to the gunsmith and have them install the sight for me.  I'm pretty happy with the product after I got the shotgun back from the gunsmith. I like the fact that in a dark or low-light environment it's easy to find a reference on the end of the blued barrel.
Pros: Works as expected in low light
Cons: Have to take the shotgun to a gunsmith
                    
This review was written in the old system and had content requirements that are different than reviews written today.