CA19 Pistol RMR Threaded Barrel with Standard Polymer Sights – Compatible With Gen 3 Glock® 19 Parts

If you’re building or upgrading a Gen 3 Glock® 19 pistol, the CA19 Pistol RMR Threaded Barrel is a core component that delivers both function and versatility. This precision-machined barrel is designed for shooters who demand reliability and want the option to mount a red dot optic or a muzzle device. It comes as a complete upper assembly, including standard polymer sights, so you can install it and get back to the range without hunting for additional parts. This is a straightforward upgrade that enhances your pistol’s capability, available with fast shipping from Miami Shooters Supply.

Key Features

• Precision threaded barrel accepts common 1/2×28 muzzle devices like compensators or suppressors.
• Optics-ready slide is cut for a Trijicon RMR footprint, allowing for direct red dot mounting.
• Includes installed standard polymer sights for immediate use upon installation.
• Machined from solid bar stock for consistent strength and reliable cycling.
• Drop-in design for Gen 3 Glock 19 frames requires no gunsmithing for installation.
• Complete upper assembly includes slide, barrel, and recoil spring assembly.

Built For

This CA19 upper is ideal for the practical shooter building a dedicated home defense or competition pistol where a red dot is essential. It’s also perfect for anyone who wants a ready-to-run threaded barrel assembly for suppressor use, creating a versatile firearm from a trusted Gen 3 platform. This is a no-fuss solution for a functional upgrade in the AR-15 Parts and accessories ecosystem.

Specifications

• Caliber: 9x19mm (9mm Luger)
• Compatibility: Designed for Gen 3 Glock® 19 frames and parts
• Thread Pitch: 1/2×28
• Slide Cut: Trijicon RMR footprint (no adapter plate needed)
• Material: Carbon steel or stainless steel construction (check finish option)

FAQ

Is this a complete upper assembly?
Yes. This CA19 Pistol RMR Threaded Barrel product includes the slide, threaded barrel, recoil spring assembly, and standard polymer sights installed. You will need to provide your Gen 3 Glock 19 lower frame, magazine, and a compatible red dot optic if desired.

Will this barrel fit my Gen 4 or Gen 5 Glock 19?
No. This barrel and slide assembly is specifically engineered for the Gen 3 Glock 19 platform. While it may physically fit some later generation frames, we cannot guarantee reliable function and recommend it only for Gen 3 models.