Introducing the Smith Defense (SD) Lower Parts Kit, compatible with GLOCK® G19 and G17 frames.
The SD Lower Parts Kit is a testament to the intersection of precision, quality, and craftsmanship synonymous with Smith Defense.
Meticulously engineered for compatibility with GLOCK® G19 and G17 frames (Gen 1–3)—including Polymer80, GST-9, Strike80, Geisler Defense, PSA Dagger, and Bear Creek frames—this kit delivers seamless fit and high-performance reliability. Both the Trigger Pin and Locking Block Pin are included.
Why Choose Smith Defense for Your Custom Build?
Each component in this kit has undergone our rigorous quality assurance process, making it the go-to choice for the modern firearm enthusiast. Every piece is a testament to detailed craftsmanship, ensuring you're equipped for peak performance right out of the box. They’re tested, retested, and examined using industry-leading methods to guarantee fit and function that surpass standard expectations. With this kit, you're not just getting parts; you're getting a commitment to precision.
Smith Defense is more than just a brand; it's a promise. We stand as a testament to uncompromising quality and relentless dedication to the firearms community. Rooted in Texas, Smith Defense encapsulates a blend of time-honored craftsmanship with state-of-the-art innovation. With over a decade in the industry, we've honed our craft to ensure every product lives up to our high standards for dependability. Opt for the SD Lower Parts Kit and feel the difference.
What’s in the Kit?
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Trigger: At the heart of the kit is the SDS trigger featuring a unique hybrid geometry—a cross between a curved and flat face that gently transitions to a flat surface. It provides the shooter with a clear index point for muscle memory while offering comfortable leeway for finger placement.
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Trigger Safety: The all-important trigger safety is no longer an ergonomic afterthought. Widened to 3x its standard width, it eliminates hotspots on the pad of your trigger finger during extended range sessions.
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Trigger Bar: SDS has raised the bar. Critical contact surfaces—including the bird's head that interacts with the connector and the sear surface on the cruciform—are precision ground and polished to eliminate stamping marks for a crisp, smooth pull and break.
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Trigger Springs: Includes a trigger spring engineered for full compatibility with both G17 and G19 size frame builds. The slightly reduced-power spring offers an improved reset feel and a clean, audible click.
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Connector: Upgraded 3.5 lb connector engineered with precise angles for a consistent, reliable reset without requiring manual bending or tweaking.
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Trigger Housing & Ejector: Designed for flawless, consistent ejection every time.
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Magazine Catch & Spring: The extended magazine catch features de-horned, melted edges so it remains unobtrusive. Its low profile blends perfectly with the slim lines of the GST-9 and feels right at home on any compatible frame.
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Slide Stop Lever & Spring: Extended construction allows for quick, positive slide lock and release, even under stress or duress.
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Slide Lock Lever & Spring: Slightly extended with tapered ends to provide increased leverage during takedown without interfering with holsters.
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Pin Set: Turned to exacting outer diameter (OD) tolerances with a smooth finish and dimpled ends to accept a punch.
Note: Trigger Housing Pin and Locking Block Pin are included in this kit. If you are completing a GST-9 frame, please use the dedicated GST-9 Frame Completion Kit.
All components proudly carry the Smith Defense name, reflecting our commitment to excellence, performance, and durability.
Shipping Restrictions
Please note that this item is restricted from shipping to the following jurisdictions: California, Connecticut, Colorado, Hawaii, Illinois, Maryland, New Jersey, New York, Rhode Island, Washington, Washington D.C., and the City of Philadelphia (PA). Please verify your local laws prior to ordering.
DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.
*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.
