My friend and I were down at the range a few years ago. There were the usual lined up shooters, with long billed hats, sun shades clipped to one side of the bill, and $$ leather jackets all trussed up, and of course the glove on the rest arm, they laughed at my freind and I who showed up in jean cutoffs, and tee shirts.
We placed first and second on a 80 round match. Shut them up quick.
M1A's with iron sights, both.