the only double i ever dealt with had to be a bump fire. I had turned down a 2 stage jewell and was free recoiling for groups. I certainly was not paying any attention to correct ar trigger work.
Was w/ an leo buddy and neither of us could duplicate. I was shooting a heavy 24" no taper and the shots were amazingly close on the paper.
"You cannot invade the mainland United States. There would be a rifle behind each blade of grass."
Japanese Admiral Yamamoto, 1941
"A wise man's heart directs him toward the right, but a foolish man's heart directs him toward the left."