Well you know, After calling around a ton, nobody seemed to want my money or care to deal with ordering this. WWG didn't return any emails or calls about getting a SBL and converting it to 50ak for import to Canada... and well just plain ol nobody cared to do much. I had a few posts here looking for parts got the usual "check the banner, sponsors may have it" answers....
I decided It wasn't that hard of a task to make a 50 Alaskan, and figured "eff it, I'll do it myself"
So, I tracked down a brand new 1895 45/70 SBL. When I got it, it wouldn't cycle 45/70 rounds worth a darn like so many others you hear of so I kept that in mind during the tear down;
Here you can see my fancy Barrel vice..... lol these marlins are so easy, with the dove tail flat and the flat on the bottom for the tube mag, removing the barrel is really as simple as it gets. This didn't leave a mark on the old 45/70 barrel!
Here she is torn down waiting for parts.
While waiting for parts I couldn't find any brass or dies, so I made a 12 guage shotgun shell out of aluminum then chambered it for 50 Alaskan.... simply to Fireform brass in. This worked ok, but I still have 200pc of Starline 50 AK brass on back order should they ever do a run of it again.
Here you can see a 50 Alaskan round beside a 30/30 and a 223 rem...

Should do the trick'!
My .510" barrel showed up so I trued the lathe to +-.0005" on the centers and spent a few nights getting her looking pretty and Chambered her. The chamber turned out perfect as well as the rest of the barrel!
Here the .510 barrel sits in my custom super fancy barrel vice again.... lol ready for torque up to the receiver and go/nogo headspace checks.
Turns out the hammer still works fine.... accidentally pulled the trigger with the web of my hand under it... haha!
Now I finished assembling it, and then took the action apart about a dozen times getting the round to feed, they are a lot fatter and the internals all needed work to make it run flawlessly.
Now the last thing it did was an experiment, Marlins have a bad record lately for not feeding rounds very well from the tub mags on these 45/70''s, Mine did this as a 45/70 and as a 50 ak. I did allot of thinking and inspecting how the action moved. I realized that with looser tolerances all the "slop" builds up and ends up effecting one thing... the shell carrier... I realized these almost need to be custom fit to the gun, unless Marlin/Remington get better tolerances.... anyways, I tig welded some silicon-bronze onto the surface the lever contacts to move the carrier and simply hand filed it to fit with zero bind a next to no slop. Guess what? My gun works perfectly... any angle, and speed on the lever. Now she runs!
I had to make some dies as nobody had them either, but that was simple enough. Overall the project was a bit of work, and I have about the same into it as buying one in the US... BUT I have it now, there is no way if I waited on others this would be in my hands shooting 500 grain slugs at beer cans in my back yard right now. So in ending.... thanks me, I really didn't get much for help on this.

I am going to Africa this summer and Alaska next summer (in the orange 1971 chevy 4x4 in the first pic) so she should get some use
