It must be noted that due to the variations among models and tolerances that factories may or may not routinely adhere to, some minor fitting may be required to achieve a perfect fit, even on our fully finished drop in parts. Although it seldom occurs, you must be willing to make these changes if necessary when your new stock or forearm arrives. To determine if our stock will work with your firearm, the first thing you will need to determine is what action you have. This is done by measuring center to center on the action screws. Action length measurements are shown for each gunstock during the shopping process.