I had a local metal shop weld a short (1-1/2") section of picatinny rail to the barrel band of a Marlin 1894 C to put a light at the 9:00 position, and the end result was disappointing to me. One thing always leads to another and I ended up having to use acraglas to to "bed"/stabilize the band, yet when all was said and done, it was kind of a flimsy setup depending on a small-diameter screw to secure the band itself. I ended up making a home-brewed clamp from two slabs of aluminum to mount a light on the magazine tube at 6:00, but it was still unfinished when I just got tired of all the corncrib makeshifts that weren't needed with an AR-pattern carbine.
Despite all that, if I could pick one up (cheaply enough), I'd be willing to get a Marlin 1894 CSBL and try it all over again with an LPVO or Aimpoint micro... just because I already know what "bright ideas" of mine to avoid. And I already know for a fact that it will not be as accurate, long-ranged and modular as an AR.