I use 24 hour epoxy to glue the alum outsert to the carbon shaft. I have not had a carbon arrow break since I did this. I use them for stump shooting and hunting both. The alum shaft outsert also added about a extra 100 gr up front. No need for brass inserts etc.....Go to a local archery shop and maybe they have some alum that they have cut off when making up arrows. I think a 2216 will work. I use 1916 alum over some small dia carbons that I had in my shop and no longer the mfg had any outserts to sell me. so I made my own. The current carbons I think the 2216 would fit.