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yes they now use mil spec buffer tubes from Armalite FAQ page "Q: I want to replace the stock of my Armalite and want to know if it is built with a MIL-SPEC or commercial tube design. A: Armalite currently uses Mil-Spec diameter receiver extensions (buffer tubes). But, previously we used commercial diameter tubes. We can't tell what you have without knowing the tube diameter. If you tube has a diameter of approximately 1.145 – 1.147 inches, it is Mil-Spec diameter. Anything else is commercial. " https://www.armalite.com/support/frequently-asked-questions/ under technical

Paul, yes Sir they did. This happened around March of last year. Almost all AR manufacturers have followed suite as well such as Del-ton, Diamondback etc. There is a heavier market for Mil-Spec components.