Installing the thinner back strap returns the grip dimension to that of a typical Gen3 model, whilst setting up the thicker backstrap adds an extra 0.08 inches of grip circumference for shooters with more substantial arms. No matter how the grip is configured, the grip angle remains the same. Qty: https://glock89999.affiliatblogger.com/84900594/how-glock-can-save-you-time-stress-and-money