The 20-28 GaugeMate Gold adapter started out with an axially split design, much like the very successful 10-12 and 16-20 gold adapters. As you may or may not know, these are the thin wall adapters that do not have room for an o-ring to provide the friction for retention in the chamber upon extraction or ejection. However, the larger wall thickness in the 20-28 is such that the hull of the 28ga shotshell becomes split where it is not supported along the length of the slit. Because many people shooting 28ga shells like to reload, we took our customers’ input in redesigning the adapter. The slit has been removed with this new design, providing more support. For those users that wish frictional retention of the adapter in the chamber, we have found that a spreading a thick layer of lube on the outside of the adapter provides just enough resistance to keep the adapter in the chamber of the gun. If you have a looser fit, you may find that a thicker lubricant, such as marine grease, is more effective for you. Please Contact Us with your input as we are constantly striving to improve our products.