Above is the pairing of the Ruger/Marlin 1895 SBL in .45-70, and the Ruger/Marlin 1894 SBL in .44 Magnum.
The 1894 has an Obsidian 45 can on it in its shorter (6.7") form.
The 1895 has the Burris 2-7x Scout scope on it. The 1894 has the Vortex 1.5x5.5x Scout scope. The Vortex rear eyepiece was a tad wider and required a scope mount 1/10" higher to accommodate.
The 1894 SBL is so much shorter than the 1895 SBL that even with the can on it the 1894 is only around 1.75" longer than the 1895 SBL is without a can.
The choice of Obsidian 45 was driven by two main factors: I wanted as slim a can as practicable that was user serviceable. Say what you want about throwing non-serviceable cans in an ultrasonic to clean them out, but I shoot coated cast bullets and I wanted to ensure I had direct access to the baffles in case gunk was getting in there that an ultrasonic might not get out.
I really, really loathe the look of leverguns with really fat cans hanging off the end. The Obsidian 45, at 1.37" diameter, is very slim. The pic doesn't do it justice: in person this is a very slim can, probably about as slim a can as I can envision anyone putting out that's rated up to .45-70.
The 1895 SBL is heavier by a pound than the 1894 SBL is. With that can, which weighs 10.7 ounces, the 1894 is still lighter with the can on it than the 1895 SBL is without a can. I suspect the can is actually a little lighter than 10.7 ounces in short form, because it ships with the Nielsen device for use with pistols, and the fixed mount weighs less.
I've got probably 150 rounds through the .45-70 and I really like it with my medium-power loads. That is, 350gr bullet at 1600fps. I've had the .44 magnum with a 240gr XTP up around 1760, and am currently working up my load for my 250gr lead wide flat-nose solid cast (coated and with gas check) bullets, but anticipate stopping somewhere in the 1700s. I'm around 250 rounds in with the 1894, and it's the one I'm currently shooting while I develop my loads.
I enjoy the .44 Magnum a lot. It's a joy to shoot, actually. A can is just about the most efficient muzzle brake you can even contemplate, so recoil with my subsonic loads (just under 1100fps) felt so light it reminded me of shooting a freaking .22lr. Even with the heavier loads, with the suppressor on they are so easy shooting you could shoot these all day, and without the can I honestly was expecting more recoil than I actually feel. Perhaps the extra padding from my stock wrap (both use the exact same Wayne's Dog stock wrap and sling) is contributing to that, I don't know. I just know I really, really am enjoying this rifle, and the can on it is just the chef's kiss.
The 1894SBL uses a 5/8x28 threaded fixed mount, while the 1895 SBL in .45-70 uses 11/16x28, so you need the separate fixed mount and can't just swap the can from one to the other without swapping the fixed mount. I have the mount for the .45-70 but haven't shot it with the can yet - soon. :-)