I am looking to build a 6X45. I am looking for a platform to start with. I like the stock of the Lightweight Varminter -T and it comes in 223. I need to know if the barrel is changeable like the other Savages? Has any one tried this? Is the 25 built like a Remington and has to be rebarreled by a smith? I was going to build this on an AR upper but it is going to cost around 900 with tools. I am looking to spend around 700 to get what I am after. It is my understanding that I can get the 25 for less than 500, is that true?