I know this might a newbie type question as that's what I am. I thought I saw somewhere that they make them and you can them at various gr. weights, thanks
Three rivers archery 75,100,125 gr
We've got 5 weights available. Between the 5 adapters and the many different glue on heads the possibilities are almost endless. You can get a peek here, scroll down the page a bit.
Adapters at Braveheart Archery (http://www.braveheartarchery.us/new_page_23.htm)