Hi there guys,

I'm looking at purchasing either the M1-L or M1-S... but I'm a little confused. I currently have the NN3 II but I like the idea of the quick release and the better strength of the M1 (my NN3's vertical rail sags a bit sometimes).

The thing is, I like the short horizontal rail of the M1-S (160mm is plenty) but I want the longer vertical rail of the M1-L (also it looks stronger and less likely to sag). However, it doesn't appear possible to get this combination unless I get both larger rails? I don't want a larger horizontal rail because it will just take up more space and won't be useful.

However, I noticed in the 'includes' section that lower rail and upper rail are interchangeable. Does this mean that I could essentially use the 170mm upper rail as the lower rail, and use the 210mm lower rail as the upper rail? Would there be any trade off for doing this?

Thanks,
David