Of course the orings would be considered wear items. The handle would be the second most likely candidate to wear out. I did try to design it in such a way though that particulate matter would be less likely to enter the handle and cause wear. You will notice that the vents are directly under the barrel to keep most of the debris out and also their is a non sealing oring on the back of the main guide rod that is there specifically to keep dirt out and reduce wear. I have also been beating the crap out of my prototype and still have not had any problems.