It is a little wider than your factory trigger ...just get a punch to ease out those drift pins (2) and it actually is a drop in fit..., just be careful positioning the bolt release when reinstalling the timney trigger as you reinstall the drift pins it will punch out the factory provided pins on the Timney... They come preset at the factory at 3lbs...check your clearance in the trigger area on the stock ...and if needed dremel out the opening where it is touching...you don' t want contact in that area...that is about it... Hope that helps....Just be patient