Enhance your ATM gearbox performance with this 1.2mm piano steel wire spring upgrade. Measuring 19cm in length and finished in black, this spring is engineered to improve firepower and extend shooting range. Crafted for durability and precision, it seamlessly fits ATM gearboxes, delivering reliable and consistent power for advanced users seeking optimal performance. 

Specifications:

Material: piano steel wire.
Spring type: 1.2mm.
length: 19cm.
Color: black.
Compatibility:  atm gearboxes.
Package includes: 1* atm upgraded spring part.