Drops on Glock 23 Gen 1-3 frames in .40 S&W. Shop-assembled and function-tested in our Florida shop on a Remsport black nitride bullnose stripped slide blank — Gen 5-inspired aesthetics on Gen 3 geometry. Drop-in install, no gunsmithing.

Finish: matte black nitride on both slide and barrel — uniform, low-glare, holster-friendly.

Specs

• Caliber: .40 S&W
• Compatible hosts: Glock 23 Gen 1, Gen 2, Gen 3 (NOT Gen 4 or Gen 5)
• Optic cut: RMR footprint with recoil bosses (Trijicon RMR/SRO, Holosun 407C/507C)
• Iron sights: tall polymer, suppressor-height, co-witnesses RMR red dots
• Barrel: black nitride, drop-in, installed
• Internals installed: 3CR firing pin, extractor, plunger assembly, recoil rod, cover plate
• Optic screws (not included): 6-32 × 1/3" cover plate, 6-32 × 7/16" optic mount

Confirm your lower is a Glock 23 Gen 1-3 pattern — this upper will not fit Gen 4 or Gen 5. Lube wear surfaces and run roughly 200 rounds of standard .40 S&W ball for break-in before defensive use.

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