Your correct about the 24s without the side ribs being not as accurate. I have a 24 series P .22 LR over a 3"20 ga. It only has the barrel band on the end of the barrels and the bottom barrel shoots low and the top barrel shoots high. I put a maple shim between the barrels and it's almost perfect now. But it annoys me a bit.

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