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I can't help you with the Griffin 3 Lug issue but my In Lead We Trust 3 Lug muzzle adapter fits perfect in my Obsidian 3 Lug mount, so I'd say it's the Griffin. Just so you know, that was one of the 3 Lug mount brands that Rugged advised me NOT to use. Both TROS and ILWT are GTG muzzle devices for sure with the Obsidian.
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Just wanted to follow up. The ILWT 3 lug showed up today and while it's a tight fit, the Obsidian does fit it without any issue.
I contacted HK Parts and asked them what the deal is. They said that Griffin does not build their 3 lug adapter but there can be variation in the part and they offered to send me a replacement after getting mine back.
I asked them if they could instead send me the Scorpion 18x1 3-lug instead and they said yes.
They did say they've had reports of Obsidian suppressors not working with their 3-lug adapters on occasion so I guess we'll see when the new unit arrives in a week or two.