There are no inserts for 1616s just glue in nibb points. I think they weight 53 grains but I think you can add weight somehow bc there is a threaded hole in the point. I think the company is pdp.
I found for my girlfriend who will only be 3D shooting and target shooting I got some 125g tips ruffed em up and glued them right into the shaft they fit just perfect. I tested them out and shot em out of my 50# widow into every target I had (3 3D deer, 2 excelsior bales, 2 blocks, and a bag target) multiple times and it held like a charm!