19 Steel Tooth Piston SR25/R85 Yellow – SHS

SHS 19-tooth piston for SR25 and R85 AEG replicas, with a body in glass-fibre-reinforced engineering plastic and MIM steel teeth. Unlike other pistons for these platforms, it also fits the A&K SR25 gearbox: a tough replacement part for servicing or upgrading the mechanism.

Features and technical specifications

• Manufacturer: SHS
• Manufacturer code: TT0040
• Type: 19-tooth piston for SR25 and R85 gearboxes
• Body: glass-fibre-reinforced engineering plastic
• Rack: 19 full-length steel teeth, made by MIM (Metal Injection Moulding)
• Compatibility: SR25 and R85 AEG replicas, including the A&K SR25 gearbox
• Colour: yellow

Operation

MIM produces steel teeth with a precise, consistent shape that mesh smoothly with the sector gear and withstand wear far longer than plastic teeth. The glass-fibre-reinforced body gives the piston the strength it needs to cope with repeated compression cycles.

Installation

Fitting it requires opening the gearbox, which is also the right moment to check the piston head, spring and spring guide. It is the recommended choice for A&K SR25 replicas; for other SR25 and R85/L85 gearboxes, the blue polygonal SHS TT0087 is also available.