I don't know for sure G37. CR would know.
Casey will be doing all of the work on my M2 in early December, including the Taran Tactical AccuGuide (Vs welding it), opening & polish the loading port, installing a TT trigger spring and tuning it, polish/port lifter gate, TT safety & bolt release, etc. I should be getting my Nordic Comp tube/bolt handle/barrel clamp in the next few weeks from Brownells.
All in all it should make for a nicely tuned M2. Only small piece missing in a couple of extended chokes. Stocks ones are fine, but they are flush fit.