I went to the range this morning, for probably the last Thursday in a long time. Next Thursday I'll be back at work.
I took the AR, my Bushmaster in .223/5.56 and made sure I had a good battlefield zero. I used the iron sights and the 25 meter zero target I downloaded here. (.pdf file. Be warned.)
Six shots and I was in the groove. If you don't need the M16A2 zero target, he's got some other targets on this page.
I enjoyed shooting the AR with irons. It took me back 34 years, to when I first put an M16A1 on sandbags. Has it been that long?