I have the model LG-105 Defender C-T grips on an older model 60 and also on a newish 442. There is some interference on the left side with the HKS speedloader. It will work, but more slowly that it is intended. If it bothers you, you will need to dremel the left side stock interference area and perhaps paint some clear polyurethane on the area you grind away. This will make it slicker.