Hi Daryl
the choke in my M6 is ful or rather tight .it is made by CZ for springfeild and stainless steel there is no choke marking indicating that on the gun. sadly the 410 slugs are always very light and no factory try to make a decent ½ ounce(220 gr)+ slug for this caliber as in 3 inch shells the shot loads are up tp nearly 3/4 ounce weight. i am sure with a heavier slug than 200 grain it would do nice for games of deer seize att under 50 yards range,but 1/5 and even 1/4 ounce slugs are rather light.
cheers
Daniel