Remember this. The causes of most stoppages with the AR or most semi auto rifles is overloaded mags, unseated mags, lack of lubrication and lack of support when releasing the bolt carrier group. The majority of feedway stoppages I have seen in teaching occur upon the first loading (admin) before shooting starts. And after running the gun empty and reloading to continue shooting. These are shooter induced (failing to load mag correctly, failing to lube, failing to seat or riding the charging the handle if you use it-which is discouraged and failure to support).