The Carbine is pretty decent. It has a very quick reload and good accuracy, and although the fire rate is a little slow, and it only has 7 rounds.
The Lancaster is the best overall. It has a good capacity (14 rounds), great accuracy, and a high fire rate, but it reloads slowly..
The Litchfield is the worst. While it has 16 rounds, and does the highest damage, it also has the slowest rate of fire, the worst accuracy, and a slower reload.
The Evans is alright. It has a very high capacity (for its time) of 26 rounds. However, it also has a VERY slow reload, and the lowest damage.
Overall, I would rank them
1. Lancaster
2. Carbine
3. Evans
4. Litchfield