Just put a 16.5" tactical solutions barrel on my 10/22. It has a leupold vari-x 111 4.5x14 scope and a new hogue stock. I shot it for the first time today and it was all over, I'm talking 6 to 7" groups at 50 yds off of a bipod and sandbag. I was shooting remington viper hyper velocity .22s, That's all I had. Tactical solutions suggests using CCI mini mags. The ammo can't make that big of a difference can it? I believe tactical solutions claims 1" groups at 100yds, and I've read tests where they have shot 7/16 groups at 100yds using CCI mini mags.