Product Description 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.