300 Whisper Upper + Gemtech HVT suppressor = Problem

[agentloveless]

Ok guys, I bought a 300 Whisper upper and a Gemtech HVT suppressor but I have a compatibility problem. After taking off the flash suppressor I cannot tell what the thread pitch is. I thought it was going to be 1/2 x 28 but the threads are finer. Doing research online it appears it can be either a 1/2 x 32 or 1/2 x 36. Does any one know a good way to figure out which? The other problem is that my suppressor is 5/8 x 24, I intended to get an adapter but I have read some posts that state adapters and suppressors are a bad idea because they can compromise the precise alignment and lead to baffle strikes. Any advice on this? Does anyone know where I could even get this type of adapter? Is it better to simple get another barrel with a 5/8 x 24 threading? Thanks.