I'd probably do it. I've got a 20" barrel on my Grendel and a rifle buffer. When I built it, one of the more common complaints were getting the gas right. Mine worked fine with a normal gas block - but with a can - give yourself options.
Thanks...I rather not use an adjustable GB. But always good since you can tune the AR to where it will extend the life of your brass and reduce wear on the bolt.
Good choice.Well... I went the 6.5 Grendel route. I just ordered my barrel, bcg and mags. I'll post some groups when I get everything installed.