RetroArms 8mm CNC gearbox with quick spring change, V2.2 HK417 is made from highly durable Dural EN AW 7075 T651 aircraft-grade aluminum, which offers greater mechanical strength than traditional structural steel. The selected manufacturing materials make the Retro Arms gearbox an unparalleled alternative to conventional zinc alloy gearboxes.
Quick Spring Change
All Retro Arms CNC gearboxes feature a quick spring change system. This allows the spring to be replaced without disassembling the gearbox, through an opening at the rear. The spring can be changed by gently pressing the spring guide inward and turning it using a hex key.
Note! Do not use MAXX MODEL cylinder heads or similar parts with Retro Arms CNC gearboxes if they do not transfer impact to the front edge of the gearbox. The pins designed to keep the cylinder head in the correct position should not absorb the piston impact. Using an incompatible cylinder head will damage the gearbox.
Installing internal parts requires experience and skill. There are many airsoft manufacturers on the market, and each creates its own standards for parts. For this reason, when using parts from different manufacturers, some fitting may be necessary.
