The 1st one should be fine, there's plenty of 1911 longslide builds. The 3rd one's probably nearing the edge of being functional.
The middle one is definitely way past the edge, which is likely why it's been completely redesigned to actually be gas-operated (although I wasn't able to quite figure out how exactly it works from the article).
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Do the slides....slide? They're huge!
The 1st one should be fine, there's plenty of 1911 longslide builds. The 3rd one's probably nearing the edge of being functional.
The middle one is definitely way past the edge, which is likely why it's been completely redesigned to actually be gas-operated (although I wasn't able to quite figure out how exactly it works from the article).