I have a Greystone suppressor and also two A-Tec suppressors. The Greystone is older than the one you are looking at, but does the job okay. It is quite heavy at about 550g, twice the weight of my carbon fibre A-Tec and noise suppression is not as good as either A-Tec.
Unfortunately I didn’t find Stu easy to deal with and wasn’t that happy with his workmanship. He returned a brand new barrel that he had threaded with the blueing rubbed off one side of the barrel where the suppressor bush had contacted it, and the fact it had only rubbed off one side suggests to me the thread is not concentric with the barrel.
I am sure he has upped his game a bit since then - this was around 6-7 years ago, but I’ve never been back.
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