4311 Drop-In Trigger System (G43/43X/48)

The Johnny Glocks 4311 is the deepest slimline Glock trigger swap on the market. Where the Apex Action Enhancement Kit changes a bar and the Overwatch DAT changes a shoe and bar, the 4311 ships a complete firing system: firing pin assembly, firing pin safety with spring, rear housing with receiver and connector, and the trigger bar and shoe. Johnny Glocks builds it to a 3.5 lb pull and tunes it for a 1911-style break, meaning a tactile wall you can hold against and an instant release rather than the factory G43X creep.

Fitment covers the Glock 43, 43X, and 48 plus the PSA Micro Dagger and PF9SS frames. Johnny Glocks lists the Shadow Systems CR920 as well but flags a firing pin incompatibility on that host, so a CR920 owner should treat it as a partial fit. It costs several times what a slimline shoe-and-bar kit does, and the value case rests on the rebuild being complete: there is no leftover factory part in the fire-control group to argue with afterward.