http://www.mdtstraining.com/category/firearms/carbine/
Chris Fry is the owner/instructor and hes a very good teacher. He holds a few classes a year on long island.
There is also TMACINC run by Pat MacNamara
http://aliastraining.com/patmcnamara2-daycarbinetapsclass-sept12-132015-pittsburghpa.aspx
im actually hoping to make that class with him in Sept.
You also have Stretz Tactical up in yorktown heights (upper westchester)
http://www.stretztactical.com/
and Verdad up near Rochester i believe
http://www.verdadinvestigations.com/
then James Yeager from Tactical Response also holds classes in Pa.
http://tacticalresponse.com/collections/training/products/fighting-rifle?variant=1099672651
and the pa class is coming up quick on 4/16-4-17
Thats around my anniversary so no go on that one this year for me.
Long story short, there are plenty of options right here in Ny, and good options a few hours away in pa.
I have only been to mdts and can personally vouch for Chris Fry as an excellent instructor, but i intend to attend classes with all these here i listed. Btw, i work out of freeport, and have friends and family on LI that are itching to run some classes too.