Well, if you’re a CRF/Mauser whore like I am, you’d look closely at the FN A1 with a floorplate from tacticalcoordination.com. There is also one in the px I think. You could buy one of those, sell the stock, and buy an HTG. Comes with a Badger Ordinance rail and a solid adjustable trigger (single stage).
I’ve said it many times I hate myself for selling mine, very smooth, robust action and I believe on par with a custom feature set. Only real negative compared to an M5 is the lack of quick barrel changes, BUT the factory chrome lined barrel should last you a very long time.