The RetroArms 8mm CNC gearbox with quick spring change for Tokyo Marui Sopmod M4 is made from highly durable Dural EN AW 7075 T651 aircraft-grade aluminum, which offers superior mechanical strength compared to traditional structural steel. The selected manufacturing materials make the Retro Arms gearbox an unparalleled alternative to conventional zinc alloy gearboxes.
Features:
- Grooves in the spring retainers to help keep the tappet plate and switch springs in place
- Additional groove to hold safety components in position during gearbox assembly
- Gearbox shells are aligned using CNC-milled grooves and edges
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Compatible with TM NGRS 416D
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Compatible with TM NGRS 416C
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Compatible with TM NGRS 417
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Compatible with TM NGRS M4
Package Includes
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, each with their own standards for parts. For this reason, when using parts from different manufacturers, some fitting may be required. We recommend using only parts that are directly Tokyo Marui compatible to avoid compatibility issues.
