Engineered for custom builders, the Hyrax is a direct, tightened revision of the Predator. Stiller reworked the design and manufacturing steps, tightened clearances and tolerances, and locked headspace so approved prefit barrels drop in consistently. Each Hyrax includes a pinned recoil lug and a pinned-and-screwed 20 MOA rail. The magwell is an extended Remington-700 profile that accepts Wyatt box or standard AICS magazines. To reduce part-to-part variance, Hyrax uses a two-piece bolt for more repeatable manufacturing and bolt geometry.

The HYRAX action is offered in both Short and Long configurations, each available with Standard (.485) and Magnum (.550) bolt faces. This design allows users to select the appropriate configuration based on cartridge family and performance needs, ensuring optimal feeding, extraction, and reliability across a wide range of chamberings.

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