I've owned a Glock 21, a USP45, and a Sig P-220. With the slide back and you insert a magazine at least with the Glock and USP the first round is angled or aimed almost directly into the chamber thus(I guess)insuring reliability. But with the P-220 it's not angled at all. It appears the first round is angled directly at the ramp which has an abrupt angle to say the least. Why isn't the Sig-sauer angled into the chamber like the other two? The Sig is just as reliable. How do they do it? Best, J. Parker