Semiautomatic build kit for the Swedish K M45D. New and improved design with "J" hook safety and heavier bolt for easier cycling with a 16" barrel. Approved by the ATF and classified as a firearm and not a machine gun. This kit comes with the following parts along with a build guide. Kit includes semiauto bolt, hammer, firing pin, retaining pin, firing pin spring, two sets of springs, guide rods, bolt stop, ejector, and two rivets for the end cap locking lug. Not all parts kits have the selector switch that makes a semi auto build much easier. If your trigger group does not have the selector switch, you will have to modify it. You may need additional US made parts in order to be R922 compliant. MIG or TIG welding is required for assembly. Please note that in order to be 922r compliant, our sample to the ATF included a new 16" barrel and pistol grips which are not included in this kit. No FFL required. All ATF rules apply.