McGregor is a test complex located in McGregor, Texas and used by SpaceX for a range of tests, from Raptor and Merlin Engine firings to F9 second stages. Previously it was used for flight testing of SpaceX's Falcon 9 prototype vehicles such as Grasshopper.
Mass production of Raptor 2 is done here, where they are also tested.
As of January 2025, Raptor 3's are being tested.
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The horizontal test stands at McGregor, with a Raptor 3. c NSF
A vertical test stand with a Raptor 3, presumably at McGregor. c SpaceX