The Estrotect A.I. Gun is designed for use with 1/4cc or 1/2cc semen straws. It works well with non-split sheaths (with blue inserts).
No O ring is required—the sheath self-locks by simply pushing it into the gun. The sheath can easily be released by pressing the release lever. The plunger locking device prevents the plunger from falling during handling. This is a stainless steel A.I. gun.