How do I measure my length of pull (LOP)? Posted on November 9, 2017November 9, 2017 by admin by admin If you have a gun that fits you well, measure from the trigger to the back of the recoil pad. If not, call one of our experts at MG Arms and they will walk you through the process. Post navigation What kind of action can I get?How do I know what type of stock I need?