16 rd 1100?
There are such things as 15 rd mad extensions, I am working on getting one right now. I have many options for setting up my 1100 for shooting SG matches. I have a 7, 10, and 12 rd mag extension and a few different barrels. If it is going to be an open course without alot of movement then the bigger extensions get installed. If it is going to be a stage with lots of movement, I will use the shorter barrel/extension or just use my 11-87 Police.