Is the buffer tube mil spec or commercial size. I'm thinking about trying a different stock and don't know the correct size of stock to get. I've been out of the AR loop for about 14 years, so I'm not up on the newest info.
Never mind, did some more google search and found out it's a mil spec buffer tube. The mil spec measures 1.148 inches in diameter and the commercial measures 1.168 inches in diameter.
M&P 15 Sport Buffer Tube Mil Spec?
Linear Mode
