Well My son took my 7.5" 30 carbine home with him and made it like I wanted it. It now is a 4 5/8" 30 carbine and is a great shooter. He put a taller front sight on it from brownells. I took it out today and got it set. I had to file down the front sight to get it to set. I set a box out at 25 yds and drew a spot on it about the size of a silver dollar. Then I set the rear sight as low as it would go and started filing and shooting. When I got the bullets hitting about 3" below the spot I quit filing and adjusted the sight up. Now I have about 4" of down adjustment and plenty of up adjustment. The pistol shoots great. I put the last 5 shot's inside the silver dollar size spot at 25 yds. I like this little pistol a lot now. Outside of the 13 degree crown the pistol looks like it was made that way from ruger. My son did a great job on it. I now have all calibers that ruger offers in 4 5/8" plus one they don't but should. It really makes a sweet shooting little pistol with the short bbl. It got a little louder but not bad maybe the 13degree crown pushes the noise forward more than a flat surface would.