Riptide Rails Teases “Maelstrom” Delayed Blowback Upper for MAC-11

Eric B

April 14, 2026

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Summary

Riptide Rails has previewed its upcoming "Maelstrom" delayed blowback upper receiver for the MAC-11 platform. Available in 5.5" ($399.99) and 8" ($499.99) 9mm barrel versions, with 5.7x28mm planned, the Maelstrom aims to improve shootability for MAC-11 users with its user-serviceable bearing delay system. Production 9mm parts are anticipated in about a month.

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Riptide Rails Teases “Maelstrom” Delayed Blowback Upper for MAC-11

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