I am currently interested in converting my AR in to a more left handed friendly version. Not that I really have any issues with it now. The shell deflector does a good job and I always wear eye protection. I would like to not have to worry about a shell in the eye though if for some reason I found myself in a position where I had to defend my home with it, etc. I assume I would need to change out both the upper assembly and the carrier bolt? Thanks.