As far as stock cracking, they all crack, it's just easier to see on an LC. Unless you adapt easily to odd stock dimensions, make sure they fit you. Remington double were only made until 1910 and they all have lots of drop. The LC, Fox and Ithaca NID all use a rotary locking bolt. Good examples of all makes can be found and 12's are a drug on the market now. Have fun!