MCS the adapter ring is not really needed,they make Easy pull points for axis/mfx in 125 and 145 gr. they are designed for a smooth transition to the smaller diameter shaft.Those adapter rings make the transition better with broadheads or 11/32 points.What I did on my MFX 500 Classics was to foot it with a 1" piece of 2020,now any 5/16 point will fit flush.And 5/16 points are availible in so many more weights and makes the end of the shaft very tough.And those adapter rings run about $14 to $16 a dozen,you can foot your shaft for next to nothing with a scrap shaft.