Check the RA-Tech item that have just arrived at Tactical Quartermaster. They are still expecting more items from the manufacturer soon enough so just watch for it... "We have just received our latest RA-Tech Shipment which included Winter recoil Springs, M4/M16 Magic Pins and more Reinforced Firing pins & valve lockers. All the NPASs are now sold but we will be getting more in around the end of the month."