The Backstrap Channel Insert was developed by Glockmeister with input from the Israeli Security Forces. Testing and final approval was done by the Isreali Security Forces. Designed to guide the mag into the mag well and prevent the magazine from snagging on structures within the Glock, the Glockmeister Backstrap Channel Insert also stops dirt and debris from entering the backstrap channel - keeping the trigger mechanism clear of any restrictive elements.
This will fit into the following Gen 3 GLOCK models: 17, 18, 19, 20, 21, 22, 23, 24, 25, 31, 32, and 37. Fits RTF models. Does not fit Gen 4 frames.