Carlson, briley, trulock, doesn't matter they are all made almost identically. I have them all and they all have almost the exact same inner dimensions, a tapered cone transitioning into roughly a 1" parallel section at the muzzle. No magic formula like the choke makers want you to believe. Buy the one you can find on sale.

Eating fried chicken and watermelon since 1972.

You tell me how I ought to be, yet you don't even know your own sexuality,, the philosopher,,, you know so much about nothing at all. Chuck Schuldiner