hey Ethan

congrats on the new pistola.

i can only get 11 into my MP9c 12 round mags, however i can get 17 into my 17 round mags

i'm a big fan of the DCAEK from Apex. the kit includes a stronger (MA spec) sear plunger spring. i guess all you MA folks have very strong trigger fingers and your state government is just trying to protect you from yourselves

as for CCW; if you use a good holster that covers the trigger, you really don't need another safety on this weapon IMO. i carry the MP9c every day.