Others will, I am sure jump in with loads of advice, but basically it will depend on a couple of main things, which HG you go for and whether or not you can live with or without a gap between HG and upper rail.
Once you know which HG you like then it’s a case of asking which adapter nut you need.
I have the Troy Alpha. Needed the improved adapter.
Also worth noting that Tacticool does his own swap out HG.
Easy swap out with no gap, if you like that particular version of HG.
Massive choices available so good luck choosing and enjoy.
Rob.
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Utrinque Paratus
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