I think all the manufactors do upgrades every
I guess thats how they stay in business.I just bought a new Knight 45 disc,shortly before hunting season 2001,and I find out for
2002 they have changed the disc's and the twists in the barrel,You can get a conversion kit for $137 but that makes you have so much in the gun.I wrote and asked about the twist,but haven't gotten and answer.But they must have been having problems with the 1/20 twists to change it to 1/30 the next year.The only difference is I see is that you can shoot a little smaller lighter bullet in the 1/30.
I really can't complain about the 1/20 twists ,I shot one hole groups with it and took a deer at 155 yds.
So I think they are all good hunting if you get the right combination of powder,bullet.
Good luck in choosing.