Quoted:
The only thing I don't like about it is that I have to adjust the sights way up to remove the bolt for cleaning. I also prefer the fancier sights on the more expensive rifles. But the way I see it, the stock sights on the mossberg are similar to those on an AR15 or M1 Garand as far as the sight picture goes, so it's probably good practice.
And it balances well.
I might sell my old Colt collapsible stock instead to fund AR15 stuff.
There is a screw in the rear of the Mossberg sight base that you can unscrew to remove the sight from the base. The sight will return to position when you reassemble it and re-tighten the screw. The front sight is a Lyman 17A and you may want to find a set of aperture inserts for it (I assume that you are using a post now).
If you would like to upgrade the sights, you might consider the following package:
http://www.midwayusa.com/Search/#lyman%20mjt____-_1-2-4_8-16-32
http://www.midwayusa.com/viewproduct/?productnumber=511517
http://www.midwayusa.com/viewproduct/?productnumber=604728 (I believe that this is the correct adapter)
My LSB came without sights and this is the combination that I put on it. I realize that it is a $150 package and it may not be your first choice, but it would be quite a bit cheaper than swapping out the rifle.
I would ask how often you clean your rifle? I only clean mine when the accuracy begins to degrade or when I am changing to another ammo.
If you would like a different rear aperture, Joe ( http://www.aperturesnmore.com/ ) can take care of you.