If you want a Martin you can order one just about any way you want it. If you want it with 50# limbs then you can get one. You want 55#? They can make it that way, too. Martin bows are like all the rest of compounds in that they are adjustable for draw weight. You can decrease the draw weight 15# from the peak weight, meaning a 70# can be safely backed off to 55#; 60 backs off to 45#, etc.