Upgrade set for Snow Wolf Kar98k rifles

Upgrade set for Snow Wolf Kar98k bolt action sniper rifles. The package include five basic parts to increase performance. Does not require any gun modification. Aluminum piston: Unlike the original plastic, it is made of strong and light aluminum. Provides greater durability. Six air channels improove sealing. The optimal diameter of the sealing o-ring ensures a very good seal and thus a high and stable performance. Length: 79mm, outer diameter: 19.8mm, inner diameter: 12mm Weight: 19g Spring guide: Made by precision machining of stainless steel. Suitable for original SW and upgrade AirsofPro springs Spring: Made of high-quality spring steel with proper heat treatment and ground ends. Chemically blackened against corrosion. The outer diameter of the spring is about 11.3 mm and has a length of 170 mm. Springs are offered in the range from M130 to M140. According to the customer's choice. Spring guide stopper Made of steel with a black finish. Ensures maximum durability and, above all, precise axial spring guide seat in the cylinder (the original stopper is off-axis). Piston sear Made of steel with a black finish.