Smith Defense - Glock 19 Compatible Premium Lower Parts Kit

SMITH DEFENSE SD G19 GLOCK® COMPATIBLE LOWER PARTS KIT – GEN 1–3 FRAME PARTS KIT

The Smith Defense (SD) G19 Compatible Lower Parts Kit is built where precision, quality, and craftsmanship meet. Every component reflects the standards that have made Smith Defense a trusted name in the firearms community, delivering a parts kit that feels refined, reliable, and ready for serious use.

Designed specifically for G19 Gen 1–3 compatible frames, this kit works seamlessly with popular platforms such as Polymer 80, GST-9, Strike80, Geisler Defense, PSA Dagger, and Bear Creek frames. Both the Trigger Housing Pin and Locking Block Pin are included, giving you the core internals needed for your compatible build.

Each component passes through the Smith Defense quality assurance process, where parts are inspected, tested, and retested using industry-leading methods. The result is a kit that offers consistent fit, reliable function, and a shooting experience that lives up to the Smith Defense name.

Features & Specifications:

• Wide Compatibility: Works with G19 Gen 1–3 compatible frames including Polymer 80, GST-9, Strike80, Geisler Defense, PSA Dagger, and Bear Creek frames.
• SDS Hybrid Geometry Trigger: Unique profile blends curved and flat trigger faces, giving a defined index point for consistent finger placement while allowing natural comfort and control.
• Enhanced Trigger Safety: Safety tab is widened to approximately 3x the standard width to reduce hot spots and discomfort on the trigger finger during extended range sessions.
• Precision-Ground Trigger Bar: Critical contact surfaces, including the bird’s head that interfaces with the connector and the sear surface at the cruciform, are precision ground and polished for a smooth, crisp pull and clean break.
• Improved Trigger Spring: Slightly reduced-power trigger spring enhances the feel of the reset and delivers a more audible, tactile “click.”
• 3.5 lb Connector: Tuned connector geometry is optimized for consistent, reliable reset and a cleaner break—no tweaking or guesswork required.
• Trigger Housing & Ejector: Engineered for dependable ejection patterns and smooth, repeatable cycling.
• Extended Magazine Catch & Spring: Extended-length mag catch with de-horned, melted edges stays low-profile while remaining easy to reach; blends cleanly with slim-profile frames like the GST-9 but feels at home on any compatible platform.
• Extended Slide Stop Lever & Spring: Slightly extended design allows fast, confident slide locking and release—even under stress or when running the gun hard.
• Enhanced Slide Lock Lever & Spring: Subtly extended and tapered ends provide extra leverage for takedown and fieldstripping without causing holster interference.
• Precision Pin Set: Pins are turned to tight OD tolerances with a smooth finish and dimpled ends to accept a punch, simplifying installation and maintenance. Includes both the Trigger Housing Pin and Locking Block Pin.
• Smith Defense Quality: All components proudly carry the Smith Defense name, backed by over a decade of experience, Texas roots, and a reputation for durability, reliability, and performance.

Smith Defense is more than just a brand; it’s a promise. From design to final inspection, every part in the SD G19 Lower Parts Kit is built to meet the demands of the modern firearm enthusiast who refuses to compromise on quality.

Important Shipping Restrictions: Due to state and local regulations, this item cannot be shipped to the following locations: Connecticut, New Jersey, New York, Washington D.C., Washington, Hawaii, Colorado, the City of Philadelphia (Pennsylvania), Illinois, and Rhode Island. It is the customer’s responsibility to know and comply with all applicable laws in their jurisdiction.

Glock® is a trademark of Glock Inc. Some components on our site are genuine Glock® OEM components, while others such as our 80% lowers are aftermarket and not produced by or endorsed by Glock Inc. All OEM and aftermarket parts are clearly marked.