Genuine Glock factory polymer fixed rear sight (part number SP00154) with a 6.1mm height and a white U-notch for fast contrast against the front sight. This is the standard factory rear used on standard-frame Glock models — a direct-swap replacement when the original polymer rear has cracked, chipped, or been dislodged during holster wear.

Features

• Genuine Glock OEM polymer fixed rear sight — Glock part SP00154
• 6.1mm sight height (standard OEM stack for factory front sights)
• White U-notch for quick sight contrast against the standard white-dot front
• Direct dovetail fit — no filing, no drift-fitting on OEM slides

Fits

• Standard-frame Glock 17, 19, 22, 23, 26, 27, 34, 35, and 45 (all generations)
• Aftermarket slides cut to standard Glock rear dovetail (.360" wide, 65° dovetail)

Does not fit

• Slim-frame Glock 42, 43, 43X, and 48 (different rear dovetail geometry)
• Glock 20/21 SF frames using the 10mm/.45 ACP OEM Adjustable rear (different dovetail)

Match the rear sight height to your front sight to keep point of impact on target — the 6.1mm OEM rear pairs with the OEM 4.1mm front for a 25-yard zero on 115gr 9mm. Armorer installation is recommended: use a sight pusher (or brass punch and nylon-jaw vise) and seat the sight from left to right against the OEM slide dovetail.