There are other manufacturers, but...
The top 2 items on this page are rails for lever guns.
http://www.xssights.com/store/scope.html
Skinner Sights sells several types of front and rear sights for Marlins.
http://skinnersights.com/
Do yourself a favor and go ahead and order the front sight when you order the rear.
You just might not need the different (taller) front, but 3 out of my 4 did.
More on Skinner Sights can be found here :
http://www.marlinowners.com/forums/index.php/board,66.0.html
And pretty soon, others who know much more than I will add some more info.
Charlie
The top 2 items on this page are rails for lever guns.
http://www.xssights.com/store/scope.html
Skinner Sights sells several types of front and rear sights for Marlins.
http://skinnersights.com/
Do yourself a favor and go ahead and order the front sight when you order the rear.
You just might not need the different (taller) front, but 3 out of my 4 did.
More on Skinner Sights can be found here :
http://www.marlinowners.com/forums/index.php/board,66.0.html
And pretty soon, others who know much more than I will add some more info.
Charlie