There's good reason why they didn't chrome line those varminter barrels. If it's for a varminting rig, you probably want to steer clear of chrome lining because it's not conducive to good accuracy. Sure, it toughens the barrel up and that's why it serves a good military/law enforcement purpose. For high-volume training and shooting, that barrel will last a whole lot longer. But, they can't get that lining in there perfectly even and that is supposedly why it diminishes accuracy. There will always be exceptions to this rule, but chrome lined barrels are not usually going to be super tackdrivers and my Bushmaster A3 upper is no expection. It's a 1.5"-2" shooter for the most part.
When I went looking for a vamint upper, I made very sure that chrome lining was NOT a feature of the barrel. The chrome lined barrel will indeed last you longer. However, unless you will be placing barrel life over accuracy, I'd go unlined.
