Don't know how to post pictures but, I had to tell ya'll about my first build. I designed the barrel myself and since my son is a machinist I had to do it. He used 3.5" cold roll 10 inches long, with a 3/4 by 1 1/4 powder chamber and a golf ball size bore length of 6 inches. Took it out last Sat. and my first launch with barrel set at 45 degrees and using 50 grs. of 2F went 105 yds. 60 grs. went 119 yds. and 70 to 80 grs. couldn't find the golf ball. Windage seems good, just enough that a golf ball will slid to the bottom on its on. More fun than I've had in a while. These things are addicting.