Help! I've been trying to zero a scope that I mounted on my 715T. I'm a newbie at this whole gun thing and this has, by far, been the most frustrating thing I've tried yet. First I tried the Bushnell Magnetic Boresighter but couldn't get the horizontal, windage, adjustment to go far enough to the left. I need to sort out if the scope is defective or if I'm doing something wrong. So, I got a laser boresighter at a gun show yesterday. Now, I can't get the laser piece through the muzzlebrake to seat it in the actual muzzle. Even trying to hang onto the nut that holds the muzzlebrake in place with a towel under my channel lock pliers, I now have scratched and dinged the nut on the muzzlebrake. Yes, I'm turning it left as I look at it from the front of the muzzle. And the nut is no closer to being loose than it was when I started. How on earth does anyone ever get this done? I'm open to pretty much any suggestion. I'm not so open to sending the gun back to Mossberg, having just done that for another reason a month ago.