That's a cool detail on the reload. You had 2 shots remaining in the internal box magazine. You then pulled out a stripper clip of 5 and only insert 3 and leave two on the clip.
As a person with probably more firearms knowledge than is good for me, it is good to see the details IW is putting in as compared to something like WWII where you are using stripper clips on a rifle with a scope that blocks out usage of them.