Add this to your FFL purchase order if you would like us to measure/correct headspace and test fire. We will also clean the barrel after test fire and return spent rounds. This is NOT a stand alone service, ie requires the basic or advanced trigger work at a minimum. Please ship the loaded ammo you intend to use in a separate shipment, they will be returned separate from FFL item and must ship FEDEX or UPS ground ORM-D. You cannot send loaded ammo through USPS. We obviously must receive your receiver and barrel, does not include the $25 Service To Barrel, Locking Bolt spring Upgrade which can be added to purchase order.