A friend of mine bought a Remlin 336 this spring.
Does it shoot? Yes, and accurate enough. 2 inch groups with a 30-30 are pretty decent with round nose ammo. Good enough to knock down a deer.
Does it look OK on the outside? Finish on the metal is fine. There is some gaps here and there where the stock meets the action.
Does it cycle good? Thus far Ive put about 100 rounds through it this summer for him for shits and grins. It cycles and feeds, has not jammed. Probably wouldnt hurt to tear it down and polish the internals.
Does the trigger suck? Yes it does. Needs to have a good trigger job done on it, or just put in a trigger from Wild West Guns.
Overall, Id look for an older JM stamped 336, as the used ones are about the same price or a little lower than a new one.
Im also comparing this to my grandfathers old 336 that was made in the mid '50's which probably has 1000 rounds thru it.