Kevin, unfortunately yes, there's no way to respond to someone. Just have to open a new thread each time. Ok, the first three are identical other than frame color. upc 642230261891 is black frame, 642230261990 has a gray frame and 642230262034 has a green frame. Other than that the first three are identical. Now 642230260214 comes with 3-17 round magazines instead of 2-17 round magazines like the first three and has night sights instead of 3 dot sights. Other than that it's identical to the first three. Now the last one and the one I'd probably go with 642230260207 is the same as the first three but has New Sight Configuration High Visibility Front / "Clean" Black Serrated Rear. So they're all very similar except frame color or sights. Unless you want night sights/one for $700.25 I'd go with the last one for $604.95. hope this helps and hopefully explained it well enough.

I did miss that number 4 comes with 3 magazines, Josh is correct on that, but Josh also missed that the 1st one is the push button magazine release, I prefer paddle mag release, they are fully ambidextrous, and are a fast and smooth once you get used to them.

Ok so there are differences they are similar, but here goes.
UPC #1 Is the black frame with push button magazine release ( this is similar to most other guns mag release) vp9 typically uses Europe paddle style mag release, this model also has standard 3 dot luminescent sights (not tritium night sights but they do glow in the dark for awhile after being charged with light)
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UPC#2 this fram has paddle mag release and has a gray colored frame instead of the black l, standard luminescent sights.
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UPC#3 this is the Exact same set up as number 2 but the frame is OD green in color rather then the gray (like number 2, or the standard black)
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UPC#4 main difference on this one is it has Night sights (Tritium vile night sights) that will glow all the time for at least 10 years, other then that it is a standard model, paddle mag, black grip.
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UPC#5 this one is exactly the same as number one except it has the paddle mag release instead of the push button american style magazine release, it is the standard VP9 and it is the model that I own, it has standard luminescent sights.
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And prices are tied directly to what buds current price is to restock the item. I hope this helps.