I didn't know people called that mortaring. You just did it if you had to and hoped it worked, but most of the time you don't have to. If the bolt is locked into the barrel extension, the bolt carrier isn't sticking back into the lower receiver extension, meaning you can break open the rifle. When you separate the upper and lower you have easy access to the bolt carrier and can hit it or pry on it or anything you want to. You aren't going to break that solid steel like you could break your stock by hitting the ground with it.
If I mortared an AR with a large extended charging handle latch on it, like my Badger Ordnance latch I can get a lot of leverage on, I'd worry about bending or breaking it if it wasn't 4140 alloy steel. I bought 2 smaller extended latches since I got that one that wouldn't be a problem. One is steel but the other one is aluminum that won't wear out the locking notch in the upper as fast.