This gun is now licensed through H&K. Click here for the updated version of this airsoft gun. KWA KP45 with NS2 gas system Included: Pistol, Magazine , Silicone Oil , Hop-Up adjustment wrench, and Airsoft BBs (50) The popular KP45 pistol is now updated with the KWA NS2 gas system. The new gas system increases the performance and improves the overall reliability of the gun. The NS2 internal gas delivery system is a KWA patented design that utilizes an advanced lightweight composite gas piston with a two-stage internal expansion chamber that delivers the gas more efficiently than that of its predecessors. The NS2 design also increases the weapon cycle rate and provides for a crisp, realistic blow back action. Other parts of the pistol like the recoil springs, recoil springs guide assembly, hop-up chamber, magazine followers, has also been improved along with a new magazine that is milled from a solid steel billet. This new construction strengthens the magazine’s structural integrity and increases pressure carrying capacity. The magazine feed-lip has also been reinforced.