I have been noicing that in aech group I shoot I get 2 groups of the same size about 1/2 to 1 ince appart from my box stock Bushy V-Match with various loads using 50 to 60gr bullets. It seamed to me that this could be caused by poor contect between upper and lower receivers. So, I put a small shim of about .025 inch on top of the Accu Wedge and it made a big difference in the groups.... no doubles. Now, I'm interested in hearing if any of you have found that using an expandable rear take-down pin can make a reasonble decrease in group size. What say yea? Since I am getting 3/4" groups or less when I don't get double groups maybe I shouldn't complain.