Upgrade your Tokyo Marui TM G17 Gen5 MOS GBBP with the COWCOW Steel Spring Set. Crafted from high-strength spring steel and treated with a hard coating to prevent corrosion, this set ensures durability and longevity. Experience enhanced blowback kick and reliable performance with the 120% enhanced tension nozzle and hammer springs. Achieve unparalleled precision and power with this superior spring set.