This is the NEW RELEASE 3.0 LDT Gearbox.
It now has the easy access spring guide for quick spring change without having to open up the gearbox like the older predecessor.
It is also thicker and more durable than before.

Comes fully built and Fits your TTM / BD556 / HK416
Package Contains:
– Nylon Gear Box
– Nylon T-Piece + Spring
– Motor Gear
– Alloy Inner Barrel