There should be a little nubbin on the tool they do get buggered up some times taking them in and out if it feel like it locks in you are good to go if if doesn't really lock give Smith a call and they will send you a new one.
The grip tool is practical in the ease of strap change at the range without a tool and it has practical uses. You can use it to depress the sear deactivator but more importantly it fits to remove the roll pins. Dan has posted on this subject before and it turns out you can totally field strip the M&P using only the grip tool and the slide in an emergency. Pretty cool if you ask me.
If you have broken your grip tool, I don't think you will be wondering. I dinged up one (well me or one of the bajillion people I let play with the grip straps because they were curious) pretty good, but it still works. I also handled one that someone decided that rather than reading the instructions they would MAKE it come out regardless of whatever ideas the grip tool might have on the subject. It tended to come plopping out the bottom when you dryfired the gun.
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