I have this tendency to keep using stage elements as long as they trip people up or they complain about them, so the low short port through the cinderblock keeps coming back. It's "just" short enough top to bottom that if you stick the fore-end through and try to keep the rifle vertical, it'll block the sight picture on an AR-15. In that rifle stage, we had only three targets (approx 6", approx 10", approx 12x14") and four positions: offhand, through the barrel, through the cinderblock, and over the wood barricade. 200 yards. Easy, 12 rounds, right? The average stage time was over two minutes. Best time was 61.17.
We had a combo rifle/pistol stage, a big pistol only stage, a shotgun/pistol stage, and then this rifle stage.