Ive used a great deal of scopes, red dots, holographics, and so on in my years. Ive had $1000 setups all the way down to this little $30 beauty.Packaging was a joke, plastic almost that a toy would come in. Came with 2 allen wrenches for install and adjustment and 2 batteries. Oh cant forget the lens cover.Install is simple, if you cant figure it out step away from the killing device in your hands as you are not qualified to use it. Once you have it snug on the gun make sure that everything is straight and tighten it down. I did not see where it would reccomend any loctite, I made that call on my own. Used a boresight to dial it in at home on a wall roughly 60 feet from me at the time, as the title states this is on a Shotgun (Mossberg 500).So now to the fun, the range I use will not allow anything other than Slugs on the main range, theres a specific shotgun side, but I have pistols and rifles to play with so bring them all to one spot. This is an outdoor range with some cover. On brightness 1 it was easy to see under the cover, on 5+ easy to see in noon Florida day light. First round was a tad low, as expected its a shotgun, I was on 50 yard range. Quick tweak up and on target. Without exageration both myself and my father put 100 slugs out of the gun that day, each shot as accurate as the last. I went to the shotgun side just to burn up some garbage ammo just to help with the break in of the new gun. 2 boxes of 50 2 and 3/4 trap rounds as they are cheap. Then we finished up with some more slugs, still accurate as shot 1.Follow up 2 weeks to another day at the range, still dead on did not lose zero. Plenty bright once again sunny Florida day.Clif notes, Plenty Bright, Very accurate with little sway in the sight from head movement target stays on, Cheap nothing I love this red dot. I will be buying a few more for my 930SX and my Ar-15. I could not be happier. if you are trying to decide if this red dot is for you, email me I can send you the list of Dots I have had over $100 that could not hold zero on a Shotgun.