With the ever expanding gun market and the many rimfire platforms on the market with more being developed all the time, Black Dog Machine LLC is aware of the task to provide a magazine that covers nearly all of them. They have achieved this by creating an adjustable lock up lug magazine called the Version 208, V208 (208 is the Idaho area code). The V208 magazine has eight quick change inserts where the lock up lug is at. Using the provided 3/32 allen wrench, remove one screw to change inserts up or down in .005 increments to fine tune the desirable feed height for the individual kit or firearm. They have also added some features like the front finger grooves.