The former NZ U17s and U20s representative Armstrong signed to boost Manawatu's squad on a one year deal from Auckland.
Armstrong was included in the Hurricanes wider training squad for the 2016 Super Rugby season but failed to make the final cut.
He re-signed for Turbos and will represent the side in 2017 Mitre 10 Cup.
Armstrong was included in the Hurricanes wider training squad for the 2018 Super Rugby season.
In September 2018, he agreed to a two-year extension at the club after impressing in his rookie season when he made eight appearances.
(LS September 4, 2018)
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