This is a Glock factory original trigger housing pin. It is constructed of black polymer and designed for use with Gen 4 Glock pistols using a modular backstrap. The long trigger housing pin is needed to secure a modular back strap to your pistol frame. Glock Factory Part Trigger Housing Pin 36 GLSP01774 This is a Glock factory OEM original part for your Glock. Why settle for second best or a knock off when you can have the original factory replacement part? Brand new. This replacement part is a factory original from Glock. Factory replacement parts are manufactured to the exact same specifications and tolerances and use the same manufacturing materials as the original parts which guarantees excellent fit and reliable operation.