AWB? Why?
Oh, you want an M13. Ever shot one?
I trust my life to the P7M8; the M13's grip has always felt like a 2X4 in my hand...
And concealing the M13 is like trying to hide a brick.
If you can't handle a situation with 9 and a spare 8, IMHO, you should be running -- preferably for a Mossberg 590...