Update on my Marlin 410
I took the marlin 410 apart myself. Went through complete gun with a piece of small roll steel I had. Not removing any steel basicly checking for burrs etc.
Oiled the stew out of it. Put it back togeather seems to function much much better than it did ever before except dosen't like Remington 2.5" slugs in which I found the true length of those slugs to be approx 2-3/16 length not 2.5" as stated on slug box. It function after doing what I did with Winchester, Remington game loads much better with Winchester brand slugs. Even the Winchester 2.5" slugs aren't 2.5" length approx 2and 1/4". I did get ahold of Gun-smith at Ilion, Ny that worked on this 410 told him all I did to this Marlin 410 told him I was gonna hunt with this gun on the 1-st Monday after Thanksgiving for Ohio Deer season then send the gun back to him after deer season and if he cannot find out what or why this gun won't function with all types or kinds of ammo espically Rem 2.5 " slugs and fix or repair it just send me my refund check in which Marlin already has a copy of my receipt that I faxed to them. I also think this gun like other guns favor one or certain types of ammo. In which they maybe the nature of the beast of this gun......