I asked this almost exact question here awhile ago so I just smiled when I read the question 'cause I knew what was comming. Just so you know I e-mailed ATI and they say their stocks are rated to handel the heavy loads and show one mounted on a .10ga handy and my son has one on his remmington 870 slug gun and has had no problems. The military and police use these tactical type stocks but I have no idea who makes them. Although I admit to some concern because of some reports I've heard, I do have to say that after looking and using my sons gun I find it hard to believe that they don't hold up to even a .243?