I have shot one of the ZMs. Admittedly not very many rounds. The gun belonged to Rob Leatham and he had many, many, rounds through it. As you can imagine he shoots a lot. He was impressed with it. I did not get a chance to disassemble it or talk to him about any maintenance or repairs he has had to do to it.
Shortly after I shot the gun, 6 months to a year, ZM sold the design to Para.
ZM uppers were expensive. I remember them in them in the Brownell's catalog. I think their cost was one of their downfalls. I don't have any need for a folding stock AR. I do own one, an AR 180, but I do not use it very often either.
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