Those stops were made around 1988, in the US for HK Chantilly. They were made in response to a NJSP trooper blowing most of the skin off of his left index finger. He was on the range, qualifying with his issue HK 53, when he laid the flash hider on his extended finger and fired a burst. He eventually recovered, but the heat was on HK to solve the "problem" hence the cheesy hand stop. The stop also required the use of an extended front push pin, which was also molded, and came with it. We tried to recoup our investment in the molds, and sell them through Federal Ops and Commercial Sales, but they werent a succesful item.