This insert fills the cavity in the heel of the grip body utilizing a friction fit to secure it to the frame. This keeps dirt and debris out of the backstrap channel and assist with mag reloads.
This thing really fills the hole. Keeps your hole from getting dirty. Resist temptation from sticking your finger in the hole. Since both holes are close together this thing keeps you from getting into the wrong hole. I highly recommend this as you do not want a nasty hole.
