i am also running the Nortic XXL cap on my JM 24" with a GG&G follower and mine will hold 10+1(2 3/4") and as far as a choke i am running a LM extended
i am just getting started in this 3 gun thing, i just picked up a JM Pro 24" for half the price of the others and so far so good, eats everything i have put in it and its working very nicely for me, so no complaints yet