Finish and surface aren't amazing, but fits and works well - Guntec USA AR-15 Ambidextrous Charging Handle Latch

It's not the prettiest add-on, and doesn't even look that great compared to a standard charging handle, but it fits well with a stock roll pin. It's designed well to give and extra left-hand charging option, and easier right-hand charging while still keeping two-finger charging. For someone with a little bit of experience with roll pins, installation was about 30 minutes to make sure everything was right.

I'd pay an extra $2-3 for a better finish in the future.