After years of working my way though different lever guns, I'm finally thinking of acquiring some Marlins. To be honest I've avoided them in the past because I'm not a huge fan of the butt stocks on them. But I picked up an 1895GS a couple years ago and have shot it a lot in the last year. It has wooed into wanting to explore Marlins. So as a start I've decided I want to pick up a 36 or 336 in .35 remington. I've been doing research but have a couple of questions I can't find the answers to and am hoping you guys can help.

First, when did the factory start installing sling studs on these? Second, when where these factory D/T for scopes? It looks like the early ones have "waffle" top which would not have come factory D/T, is it as simple as if the top of the receiver isn't waffled it would have come D/T?

Thanks.