Introducing Lone Wolf Large Frame Parts Kit for Glock 20, 21 without Trigger Bar, a truly universal kit at a great price that works for Timberwolf and Glock OEM frames! Not only has Lone Wolf Distributors created a kit that is truly UNIVERSAL, but it includes the industry's first truly Universal Trigger Housing (LWD-UTH)! Includes:LWD-1447-1- Locking Block Full Size 3 PinLWD-1982- Magazine Catch ExtendedLWD-280- Mag Catch SpringLWD-721- Classic ConnectorLWD-350-6- Trigger Spring 6LBLWD-420- Trigger PinLWD-427B- Trigger Housing PinLWD-4368- Locking Block PinLWD-5446- Slide Lock Spring For Glock 17, 17L, 20, 21, 21SF, 22, 24, 31, 34, 35, 37LWD-7496- Extended Slide Stop 3 PinLWD-8196- 10/45 Bare EjectorLWD-ESLL- EXT Slide Lock LeverLWD-UTH- Universal Trigger HousingLWD-UTH- WrenchLWD-UTS- Screw FeaturesWorks in Timberwolf and Glock OEM framesDrop-in install in secondsAvailable for all uses, but highly recommended for plinking, target or competition useNote: No frame included.