Genuine Glock factory recoil spring assembly for the Glock 43, 43X and 48. This is the captured dual-spring unit that sits under the barrel and controls how the slide cycles - replacing a tired one restores factory-spec cycling, recoil control and reliable lockup. Features Genuine Glock OEM factory part - same spec and tolerances as the assembly your pistol shipped with Captured dual recoil spring on a steel guide rod Drop-in replacement - no fitting or gunsmithing Sealed, non-serviceable assembly: replaced as a unit, not rebuilt Manufacturer Part Number: SP33379 Fits Glock 43 Glock 43X Glock 48 The 43, 43X and 48 share this slim-frame recoil assembly. It will not fit the double-stack Glock 19, 17 or 26. When to replace Glock recommends replacing the recoil spring assembly at regular service intervals; symptoms of a worn unit include sluggish return to battery, brass landing much further than usual, or increased felt recoil. It is a consumable wear part. Specifications Caliber: 9mm Type: captured dual recoil spring assembly Manufacturer: Glock GLOCK is a federally registered trademark of Glock, Inc. and is one of many trademarks owned by Glock, Inc. or Glock Ges.m.b.H. Neither 3CR Tactical nor this site are affiliated in any manner with, or otherwise endorsed by, Glock, Inc. or Glock Ges.m.b.H. The use of "Glock" on this page is merely to advertise the sale of Glock pistols, parts, or components. For genuine Glock, Inc. and Glock Ges.m.b.H products, visit https://us.glock.com .