Rival Arms Glock Extractor Depressor Plunger Glock 9mm Gen 3/4 Black. It's primary function is to help prevent the frame from splitting under firing stress. It also has the ability to assist in preventing sand and debris from lodging in the breech when the bolt is juggled. You can install this part during a forced or timed disassembly. The part has steel contact points with the extractor and depressor reducing wear and tear on your firearm. It functions in conjunction with the Extractor/Depressor Assembly which prevents the gas and bolt from snagging on the frame during disassembly but also allows for quick replacement in the field when needed. Specifications for Rival Arms Glock Extractor Depressor Plunger Glock 9mm: Manufacturer: Rival Arms Color: Black Package Contents: Rival Arms Glock Extractor Depressor Plunger Glock 9mm Rival Arms RA-RA62G001A: Glock Extractor Depressor Plunger Glock 9mm Gen 3/4 Black