Has been fine on the couple I’ve put one on, that said like all Chinese made guns they all aren’t up to the same spec depending on the production run. With fitting a Rem barrel on DA Grizzly’s you’ll find a couple things can happen, it will fit fine just like on an 870. Or it will fit into the receiver but the rib or front sight will be canted due to the position of the extractor, another issue is the extractor nose is too big to fit in the slot of the barrel and it won’t fully seat.
You have to cross your fingers and try it, it will vary from gun to gun unfortunately. See if you know someone that will let you test fit their barrel onto your gun.