they can be sticky on the eject on occasion but it is an easy fix . if you have a problem let me know.
i have had an 835 since they first came out. killingest shot gun i ever owned and i have owned many. turkey, deer, pheasant, grouse, chukker, quail, duck, geese, woodcock.
make sure you get a good mounting grip as they have a habit of being cheek busters. think it has to do with the porting as it keeps the barrel down but the stock comes up.
i did find a quirk that mine doesn't pattern hevi shot worth a damn. anything else and it will sure enough put them out there. shot a few 3 1/2 but have never found the need. 3' will smoke about anything.