Glock Gen 4-5 Locking Block Features The Glock Gen 4-5 Locking Block is a core internal component responsible for keeping the barrel and slide locked together during the firing cycle before unlocking to allow extraction and ejection. This factory part is machined to the same specifications as the locking block that ships in Glock s compact pistols ensuring correct fit and function without modification. It is compatible with compact Glock pistols chambered in 9mm .40 S&W .357 SIG and .45 GAP covering Generation 3 pistols produced from 2013 forward as well as Generation 4 and 5 models. A worn or damaged locking block can affect reliability so replacing it with a genuine factory part restores correct cycling. Finished in silver to match the factory appearance of Glock s internal components this locking block installs using the same factory tolerances as the original part it replaces. Because it is manufactured by Glock owners can count on consistent fit and the reliability the brand is known for. This part is well suited for armorers and owners performing routine maintenance or repair on compact Glock pistols across multiple generations. The Glock Gen 4-5 Locking Block is a dependable factory correct replacement for sale at GrabAGun. Glock Gen 4-5 Locking Block Specifications Manufacturer: Glock Model: Gen 4-5 Locking Block Type: Locking Block Color: Silver Compatible Hosts: Glock Gen 3 (2013+) Gen 4 Gen 5 Compact Pistols 9mm/.40 SW/.357 SIG/.45 GAP Available At: GrabAGun