Quicklock A.I. Gun What is a Quicklock Artificial Insemination Gun? The Quicklock Universal Artificial Insemination (AI) gun is used to control reproduction in cattle.How is a Quicklock Artificial Insemination Gun used? The Quicklock Artificial Insemination Gun can be used with all kinds of insemination sheaths and all kinds of semen straws (1/2 and 1/4 size). How does a Quicklock Artificial Insemination Gun work? Fastening and releasing of sheaths with only one hand only. Quick and secure fastening of any kind of sheaths, split or non-split. No modifications necessary when using different types of straws. No loose parts; a safety catch prevents the plunger from sliding out of the barrel. All parts made of sterilizable plastic or stainless steel.