Say what you will about the oversized pins, but I went to the 2x. Actually I got the 1x and 2x in the value pack. I have a ML Encore and a 204 barrel. Before the 2x pin i could hardly hit a bull in the ass with my ML, but my 204 was a shooter. I did have some slight movement in the barrel, so I decided to try the pins. The 1x was a bunch of bs, it measured the same as the pin that came with the gun. Now I don't know if TC sent me an oversized to begin with or the 1x is a ploy for you to buy the 2x. Whatever the case my groups when from no group to about 2" at 100 yds with the ML. Same Powerbelts and same charge as before. The 204 is yet to be shot with the new pin. The gun feels better now, much tigher all around. But you really have to drive the pin in, before you could do it with your thumb.