Defiance is an excellent action. Some of them dont have a guaranteed hs, which really is not a big deal unless doing prefits. Putting a prefit on a custom action doesnt make sense to me anyhow, Id put the money into the barrel first then the action. But thats my opinion. Defiance actions are in the top tier for straightness and ignition. The shrouds are fit extremely well, usually I get less ignition drag from them than most. Spring and pin fall are correct for top accuracy. Others mentioned here are short on both. Defiance offers different bolt fits. You have options. In the top 3 of actions for me.