BudsGunShop.com - not steel ?

It has an aluminum slide and a zinc alloy frame. thefirearmblog.com/blog/2014/01/10/gun-review-coltwalther-government-1911a1-22lr/

another review https://modernrifleman.net/2013/04/22/coltwalther-1911-gold-cup-22-lr-review/

needing to lighten the slide is why 1911 conversion kits use aluminum slides

Correction, info was incorrect at another source, it has an aluminum slide and a zinc alloy frame. thefirearmblog.com/blog/2014/01/10/gun-review-coltwalther-government-1911a1-22lr/

Dallas You are correct they are a Zinc alloy. From the review "While some shooters may complain about the use of zinc alloy in the frames, Walther has stated that this is a sophisticated zinc alloy that they selected for its durability, and therefore, they do not anticipate any issues with the frames as a result. I do not see this as an issue with this otherwise-robust .22LR."link thefirearmblog.com/blog/2014/01/10/gun-review-coltwalther-government-1911a1-22lr/

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