" 2 1/2" groups @ 100yds with the Brenneke slugs were also the norm."
You might consider bringing that to our next PD hunt.......... leave that ugly black thing at the house.
Unfortunately (for me), I bequeathed my 870 to a rookie when I retired. I haven't had another one built yet.
BTW, that was with a 14" barrel, not a 18" barrel!
So, "Old Ugly Black Thing" will still have to travel until I gather the shekels to have Mickey build a proper .223AI on my Model 7.
Ed