I have seen on youtube a video about using steel rounds in a AR with a lesser barrel than 20". Something about the timing being changed due to a shorter barrel will cause the extractor to damage over time on a steel round like Wolf or something similar. And I have also heard it makes your AR or any weapon dirty. Whatever that means. Can someone explain to me is it safe to use or not. I use wolf on my SKS and its fires fine. I am looking to use cheaper ammo so if someone could shed some light on the subject for me that would be great.