Well, I actually got a REPLY from SIG. Note that I did not say I got ANSWERS to all my questions! Don't you just hate it when your question is not answered or you get an answer instead to a question you didn't ask?
1) An adaptor to use the MCX upper on an AR lower is required. One answer I got implies to me that if you buy an upper you get the adaptor ("The uppers all ship with this piece."). I was not told how to get the adaptor if you already have a complete MCX that you want to use the upper on your AR lower. I will ask the question again.
2) No reply to why one commercial shows the adaptor in place and another one doesn't show it.
3) Trip levers for full auto fire aren't available for sale. Guess if I ever got the AR upper adaptor, I could try and make a trip.
4) Taper cap suppressor adaptor is available through customer service.
5) One has to interpret their ads/statements VERY carefully. It turns out the up to 50,000 round life only refers to the receiver itself, not any of the other parts attached. Here's the actual quote: "On a rifle such as the MCX, which was required to have an upper receiver that could fire up to 50,000 rounds before failure, it is important for parts to last." Dummy me, I read that and thought the whole upper had a long life. The 20,000 rounds of the Virtus refers to all parts.
Edited to add: I suppose companies sometimes dislike people like me for asking probing questions.
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