I've got an sumtoy 562-5 choke for the little 1187 but havnt had time to do much patterning work with it yet. I hope that gets what I'm after. If not I guess an ic 555 will be on the way
Sumtoy 562-5 is the real deal from my 21" youth 870 using the Federal HW 7's and Hevi13 #6's