Hyrax Action

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 (rail not installed). 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.

Receiver Type: Stiller Hyrax

Receiver Material: 416-R Stainless Steel

Receiver Finish: Glass Media Blasted

Receiver Diameter: 1.35” (Remington 700 footprint)

Headspace: 0.700” ± .002”

Breach Thread: 1.0625-16 TPI

Magwell Cut: Extended Remington 700

Scope Mount Pattern: Stiller Round 8-40 (Savage rounds)

Recoil Lug: .187” straight pinned lug

Total Weight: ˜28.4 oz (configuration dependent)

Bolt Style: Push Feed

Bolt Configuration: Two Piece

Bolt Handle: Straight Only

Bolt Handle Material: 7075-T6

Bolt Lift Angle: 90 Degree

Bolt Material: 4140 Steel

Bolt Finish: Melonite

Trigger Sold Separately.

Note: This item will only ship to a Federal Firearms License Dealer (FFL). Before this product is shipped your FFL Dealer must email or fax a valid FFL to Cal Shooting Supplies. Your order maybe delayed if not received. For fastest processing, please include customer name and order id with the required documentation.

It is the responsibility of the purchaser, to check their local laws before ordering products from calshootingsupplies.com. Please check your State, County, and City laws for restrictions before ordering and always include the order number. All action kits have a varying ship time from 1 to 12 weeks, no statuses will be done on these items until the 12 week period has expired and a valid FFL is on file.

Absolutely no refunds, changes, or cancellations once your order is placed.

FFL Email Address: nikki@calshootingsupplies.com