I am sure Tony (Tromix) could make the .444 Marlin work without too much trouble...maybe a slight modification to the magazine....like HC said a new follower...something...his issue is that he is making these for resale and doesn't want to deal with magazine work, nor does he want to deal with whiners and customer service issues when people use the 10 round magazines and start having feeding problems. I completely understand and respect that. That being said I still want one. I'll deal with my own 10 round issues....lolol
On another little note I believe SureFire Magazines is now making a 10 round for the Saiga 410...I wonder if it would work any better? Hmmmmmmmmmmmmmmmm??