Hrm...maybe reading the Marlin Manufacturer's subforum http://www.gunandgame.com/forums/marlin/
would have quickly answered this question for ya before posting in this side of the forum
But heck, it's probably a question on many folk's minds...with the $25 Marlin 795 rebate & all...
There's a post there about the upcoming High Capacity Marlin 795 mags...which are due out around Hunting season/Xmas shopping time this year.
Currently two MFR's are working on 795 mags...so now we wait
The National Magazine 15-round magazine is to be avoided unless you want to spend hours hand-fitting & tweaking & dremelling until you want to find a National Magazines employee and beat them with a whiffle bat until unconscious. (The thought HAS crossed my mind....) ANY 15-round Marlin Mag for the 795/70 is to be avoided, they're all National Magazine mags, it's just that not all purveyors mention that little important fact.
I have two of the National Magazine mags...I've only managed to get ONE to work so far.
The other option with the National Magazine mags is to cut off the feed lips, weld it to the bottom of a Marlin brand magazine, and tie the springs together, giving one a 25-round mag that works halfway decently. Of course, only ONE person has ever done this...and it about drove them nuts.
So we are all waiting with baited breath for the MFR's to put out a decent 795 Hi-Cap magazine...it just takes time.
The question doesn't help, but the answer does