I shoot my RA tricut into all sorts of rocks and have never had an issue with it...maybe different brands dull differently?
RA metal is much harder than hardened stainless steel shafts.
And who cares about enclosed tracks! <img src= " height="23" srcset="https://spearfishing.world/forum/images/smilies/emojione/1f606@2x.png 2x">