When reading the post people made about them my favorite was " You may be subject to taking a charging handle to the check and teeth.".I thought my response gave one reason they made them. They allow ambi charging for cheaper than a typical ambi charging handle. All the ambis I have tried for similar or cheaper than the latches have fallen apart with even light range use. I don't have one, but I can see it as a way to get ambi operation without paying $100 for a decent ambi.