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  • Post category:Glock / Lower Receivers
  • Post last modified:September 28, 2023
  • Post published:December 5, 2022

Best Glock Lower Parts Kit

What is the Glock Lower Parts Kit? 😉

It is a set of all the internal parts needed to complete a Glock pistol frame. This set is typically used to build custom Glock pistols from scratch or to replace worn or damaged parts in existing Glock pistols. They can also be used to convert a Glock pistol from one generation to another.

Our Top Pick
Centennial Defense Systems Lower Parts Kit For Gen 1-3 Glock 17
This comprehensive kit provides all the essential components to enhance your firearm's performance, featuring a trigger housing equipped with an OTS trigger, an extended slide release, and an extended magazine release. The inclusion of a 3.5lb connector ensures a more seamless and uniform trigger pull, resulting in enhanced accuracy and competitive advantage.
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Parts 🧐

📌 Trigger assembly  This is the main trigger component that you pull to fire the handgun. It includes the trigger, trigger bar, connector, and firing pin safety.
📌 Locking block A block that fits inside the frame and contains the locking lug that engages the slide’s ejection port when the gun is in battery. It provides a secure lockup between the barrel and the slide.
📌 Trigger spring Provides tension to reset the trigger after firing. This spring pushes the trigger bar forward.
📌 Firing pin safety spring Pushes up on the firing pin safety to enable it to block the firing pin until the trigger is pulled.
📌 Extractor depressor plunger assembly Contains a spring-loaded plunger that keeps downward tension on the extractor, allowing it to properly grab the rim of cartridges for extraction.
📌 Extractor spring Provides tension to the extractor so it snaps over and extracts spent cartridge cases.
📌 Slide lock spring Presses upward on the slide lock so it engages the slide’s cutout when the magazine is empty.
📌 Magazine catch assembly Contains the magazine release button and spring. Allows for easy removal of the magazine by pressing the button.
📌 Trigger housing with ejector Encases the trigger assembly and houses the internal ejector which ejects spent rounds.

Features 😎

⚪ Firstly, the trigger assembly is a crucial component, allowing the user to pull the trigger and fire the handgun. It contains the curved trigger itself, trigger bar, connector, and firing pin safety. The smooth, rolling trigger pull is a hallmark of Glock pistols. The connector transfers the trigger’s rearward motion into the firing sequence. The firing pin safety is a pivotal internal safety that blocks the firing pin until the trigger is pulled all the way to the rear.

⚪ Secondly, the locking block is a precisely machined steel block that fits into the polymer frame and houses the locking lug that engages the slide’s ejection port. This provides a sturdy interface between the barrel/slide and frame for accurate shooting. The precision fit of the locking block contributes to Glock’s reputation for reliability.

⚪ Moreover, the trigger and firing pin safety springs provide the proper tensioning for the firing mechanism and safety to operate. The trigger spring returns the trigger forward after firing, while the firing pin safety spring keeps upward tension on the safety. Proper spring tension is essential for smooth trigger pull and safety functions.

⚪ Finally, the slide lock spring keeps upward tension on the slide lock so that it engages the slide’s cutout when the magazine is empty. This locks the slide back, signalling that the gun is empty. The magazine catch assembly allows quick, easy removal of the magazine by pressing the magazine release button.

Benefits 🥳

🟣 One of the primary benefits of a Glock LPK is the ability to fine-tune trigger control. Components like a 3.5lb connector and trigger housing result in a lighter and smoother trigger pull, leading to better accuracy, reduced trigger jerk, and improved follow-through during shots.

🟣 Glock LPKs allow firearm enthusiasts to customize their Glock pistols to suit their preferences and shooting styles. By replacing standard parts with LPK components, users can create a firearm that feels more tailored to their needs, whether it’s for competition shooting, self-defence, or target practice.

🟣 From our experience, we can say that upgrading to a Glock LPK can provide a competitive edge in shooting competitions. The smoother trigger pull and improved components, such as the extended slide release and magazine release, enable faster and more precise shooting, which is valuable in timed or competitive shooting events.

🟣 Upgraded LPK components can lead to a shorter trigger reset, allowing for faster follow-up shots, which can be advantageous in situations requiring rapid fire or multiple shots, such as self-defence scenarios.

Best Glock Lower Parts Kit Reviews

#1 Cross Armory Standard Lower Parts Kit

Cross Armory Standard Lower Parts Kit

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Are you required to complete the lower frame of your new Glock 17 or 19 build? Or maybe you’re just giving your old Glock a much-needed rebuild. Either way, you’ll want to pick up a Cross Armory Standard Lower Parts Kit. This high-quality kit comes with everything you need to get the job done quickly and easily, including a pre-built trigger for quicker assembly. Plus, it comes with one slide lock spring for a compact frame and one for a full-size frame, so you can choose the right one for your build. And since it’s compatible with both Gen 3 Glock 17 and 19 frames, as well as Polymer 80 frames, you know it’s built to last. So don’t wait any longer, pick up a Cross Armory Standard Lower Parts Kit today!

  • High quality
  • The pre-built trigger for quicker assembly
  • Compatible with Glock 17, Glock 19, and Polymer 80 frames
  • May require additional assembly


#2 Cross Armory Lower Parts Kit

Cross Armory Lower Parts Kit

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Want to purchase a high-quality lower parts kit for your Generation 3 Glock 43 or Polymer 80? Note the Cross Armory Lower Parts Kit! This kit comes with everything you need to complete your lower frame, including the trigger, which is pre-built for quicker assembly.

  • High quality
  • The pre-built trigger for quicker assembly
  • Comes with everything needed to complete the lower frame
  • Trigger is pre-built, and may require adjustments


#3 JE Machine Tech Lower Parts Kit

JE Machine Tech Lower Parts Kit

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The JE Machine Tech Lower Parts Kit is a must-have for any gun enthusiast. Made from heavy-duty materials, this kit is designed to last for years to come. It includes all the parts you need to complete your lower receiver, making it the ideal upgrade for your pistol. With its superior quality and durability, the JE Machine Tech Lower Parts Kit is an excellent choice for anyone searching for the best possible parts for their gun.

  • Durable construction
  • 5lb connector
  • Trigger with trigger bar and trigger housing are bagged individually
  • Competitive price
  • May not be compatible with all Glock models
  • Not available in all colours


#4 Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 17

Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 17

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Looking to upgrade your Glock 17 or complete a new build? Check out Centennial Defense Systems’ lower parts kit with extended controls. This kit includes everything you need to take your gun to the next level, including a trigger housing with an OTS trigger, extended slide release, and extended mag release. With a 3.5lb connector, you’ll have a smoother, more consistent trigger pull that will improve your accuracy and give you an edge over the competition.

  • Easy installation
  • Trigger housing with OTS
  • 3.5lb connector
  • Only comes with a 3.5lb connector


#5 Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 19

Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 19

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The Centennial Defense Systems Lower Parts Kit for Glock 19 is an excellent upgrade for your current Glock 19 or to complete a new build. The kit includes a trigger housing with OTS, magazine catch spring, slide lock spring, trigger spring, 3.5lb connector, extended slide release, extended mag release, extended slide lock lever, trigger pin, trigger housing pin, and locking block pin. The quality and craftsmanship of the parts are unmatched and will provide you with a lifetime of dependable use. Whether you are a competition shooter, law enforcement officer, or civilian defender, the Centennial Defense Systems Lower Parts Kit for Glock 19 is the only choice for those who demand the very best.

  • Stainless steel construction for durability
  • OTS included
  • Extended slide release, mag release, and slide lock lever for quick and easy operation
  • Stainless steel construction may not be as durable as other materials


#6 Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 26

Centennial Defense Systems Lower Parts Kit for Gen 1-3 Glock 26

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The Centennial Defense Systems Lower Parts Kit for Glock 26 is a faultless way to upgrade your existing Glock 26 or complete a new build. This lower parts kit includes an extended slide release, extended mag release, and extended slide lock lever, providing superior control and functionality. The trigger housing with OTS allows for a smoother, more consistent trigger pull, and the 3.5lb connector provides a crisp, clean break on every shot. With your choice of 5lb or 6lb trigger spring, and 2.5lb or 5lb magazine catch spring.

  • Superior functionality
  • Improved trigger pull
  • Choice of spring weights
  • OTS may not be for everyone


#7 Centennial Defense Systems Lower Parts Kit For Glock 43×48

Centennial Defense Systems Lower Parts Kit For Glock 43x48

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Need to upgrade your Glock 43X or 48, or build a new gun from scratch? Centennial Defense Systems has an outstanding lower parts kit for you. The kit includes an OEM trigger housing with OTS, magazine catch spring (2.5lb or 5lb), slide lock spring, trigger spring (factory weight +25% power +50% power), 3.5lb connector, Tango Down slide release, extended mag release (serrated or stippled), extended slide lock lever, trigger pin, and trigger housing pin. Everything you need to take your Glock to the next level!

  • OEM Trigger Housing with OTS
  • Extended Mag Release (Serrated or Stippled)
  • Extended Slide Lock Lever
  • May be difficult to find


#8 Tiger Rock Glock 19 Complete Lower Parts Kit

Tiger Rock Glock 19 Complete Lower Parts Kit

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Demanding a complete lower parts kit for your Glock 19? Pay attention to the Tiger Rock Glock 19 Complete Lower Parts Kit! This kit includes everything you need to complete your lower. The Polymer 80-compatible kit is perfect for those looking to upgrade or replace their existing parts. With a black finish, this kit is perfect for those who want a more subdued look. The included extended slide stop release and extended magazine release are perfect for those who want more functionality out of their gun. The kit also includes a trigger housing pin, trigger housing with an ejector, trigger pin, trigger spring, and trigger with trigger bar. Get everything you need in one easy-to-install kit!

  • Easy to install
  • Extended slide stop release
  • Black finish
  • Does not include a frame locking block and magazine


Maintenance 📝

As avid Glock owners and enthusiasts, our team learned the proper way to clean a Glock lower parts kit over the years. Here’s our step-by-step guide, from personal experience:

✅  First, we field-strip the handgun as outlined in the Glock manual, removing the slide, barrel, recoil spring assembly, and magazine. We lock the slide back using the slide stop to release the tension on the firing pin.

✅ Then, we use a Glock disassembly tool to depress the extractor plunger, allowing me to remove the extractor and firing pin for deeper cleaning later. With the extractor removed, we have an opportunity to lift out the locking block and remove the trigger mechanism housing.

✅ Now with full access, we use compressed air to blow out any debris or residue around the trigger assembly, trigger/firing pin springs, and interior of the magazine well. Based on our experience we recommend inspecting it for any obvious damage or abnormal wear.

✅ Using a nylon brush dipped in solvent, we gently scrub the trigger bar, connector, trigger and sear surfaces to remove any built-up carbon or fouling. It is important to take care of any engagement surfaces and springs.

✅ For the metal components like the extractor, firing pin, and locking block, we used different methods, but it turned out that a copper brush and solvent to break up stubborn carbon deposits or fouling. We wipe down with a rag and oil lightly.

✅  After cleaning, we reassemble using a little bit of lube on the mating surfaces of the trigger bar and connector. It is advised to test the fully reassembled lower with snap caps to ensure smooth operation.

Follow the Glock manual and use proper tools to avoid damaging any components. Regular cleaning contributes to the reliability of your Glock pistol.


Is it legal for a civilian to purchase a lower parts kit?

🟩 Yes, it is legal for a civilian to purchase a lower parts kit in the United States. Lower parts kits can be purchased and shipped directly to your home without the need for a background check or FFL transfer.

❌ However, it is important to note that once you assemble a lower receiver from a lower parts kit, it becomes a firearm and is subject to all applicable laws and regulations. This means that you will need to pass a background check and have the lower receiver transferred to you through a licensed dealer.

It is also important to note that some states have additional restrictions on the purchase and possession of lower parts kits. For example, some states require residents to obtain a permit or license before they can purchase a lower parts kit. Other states have banned the sale of lower parts kits altogether.

If you are unsure about the legality of purchasing or assembling a lower parts kit in your state, it is always best to consult with an attorney or firearms expert.

Are Glock 17 and 19 lower parts the same?

☑️ Yes, the lower parts kits for the Glock 17 and Glock 19 are interchangeable. Since the Glock 17 and 19 share the same frame size (the mid-sized SF/Gen 3 frame), the trigger mechanisms and other lower parts are identical and fully interchangeable between the two models.

⭕ The only differences between the full-size Glock 17 and the compact Glock 19 are in the slide and barrel lengths. The Glock 17 has a 4.49-inch barrel and full-size slide, while the Glock 19 has a 4.02-inch barrel and shorter compact slide. But the frame dimensions and lower fire control group parts are exactly the same.

⏭️ Therefore, you can use a Glock 17 lower parts kit to build a Glock 19 and vice versa. All the trigger assembly components (trigger bar, connector, ejector, trigger spring, etc.), locking block, slide stop, takedown lever, magazine release and other lower parts will fit perfectly in either frame and allow the handgun to function normally.

Does the Glock lower parts kit contain the frame or polymer body?

No, it does not contain the frame or polymer body. The lower parts kit is a set of small parts that are used to complete the lower receiver of a Glock pistol. These parts typically include the trigger, trigger bar, trigger housing, connector, slide stop release, slide stop release spring, magazine release, and magazine release spring.

The frame or polymer body is the main component of the lower receiver. It is the part that houses the fire control group and other internal components. The lower receiver is typically made from polymer, and it is sold separately from the lower parts kit.

To assemble a complete Glock lower receiver, you will need to purchase both the lower parts kit and the lower receiver itself. You will also need to have some basic gunsmithing tools and skills.

What is an enhanced lower parts kit?

An enhanced lower parts kit (LPK) is a firearm accessory package designed to offer improved or upgraded components for the lower receiver of a firearm. These kits are popular among firearm enthusiasts and builders who want to enhance the performance, ergonomics, or aesthetics of their firearm’s lower receiver assembly. Here are some common features and components found in an enhanced lower parts kit:

📌 Upgraded Trigger: Enhanced LPKs often include a higher-quality or specialized trigger mechanism. This can result in a smoother, lighter, or more predictable trigger pull, which can improve accuracy and overall shooting experience.
📌 Extended Controls: Some kits feature extended components such as an extended magazine release, extended bolt catch, or extended safety selector. These enhancements make it easier to manipulate these controls, especially for shooters with larger hands.
📌 Anti-Rotation Pins: Some kits come with anti-rotation trigger and hammer pins, which help prevent wear and tear on the lower receiver and maintain consistent trigger function over time.
📌 Reduced Creep or Overtravel: The enhanced LPK may include components that reduce trigger creep (the slack before the trigger breaks) and overtravel (the distance the trigger travels after the break). This can contribute to more precise shooting.
📌 Enhanced Buffer Tube Assembly: The buffer tube assembly in an enhanced LPK may include an upgraded buffer, buffer spring, or adjustable stock for optimized recoil management and user customization.
📌 Custom Aesthetics: Some enhanced LPKs come with components designed to enhance the visual appeal of the firearm, such as engraved or coloured parts.
📌 Modularity: Enhanced LPKs may be designed to accommodate various accessories or attachments, making it easier to personalize the firearm according to the user’s preferences.
When it is necessary to change Glock lower parts?

There are a few key situations when it becomes necessary to replace the lower parts in your Glock pistol:

🔘 Firstly, extensive wear over high round counts can degrade the lower parts. The trigger bar, connector, ejector, and springs are subject to lots of movement and friction during cycling. After thousands of rounds, you may notice more friction in the trigger pull, ejection failures, or firing pin hesitation indicating worn parts. Replacing the full lower parts kit restores proper functioning.

🔘 Secondly, if certain parts break due to an accident or improper modifications, they obviously need replacement. For example, people tweaking their trigger pull have been known to break a connector or bend the trigger bar. Cracked trigger housings are also possible. Broken parts require immediate replacement.

🔘 Thirdly, damage from foreign debris can ruin lower components. Something like a small pebble stuck in the trigger bar channel could prevent trigger movement, requiring a new trigger housing or trigger mechanism. Similarly, debris or case ruptures impacting the extractor or firing pin can damage those parts.

🔘 Finally, some owners elect to upgrade factory lower parts for performance enhancement reasons, such as lighter trigger springs, polished connectors, or adjustable triggers. While not “necessary”, this improves the trigger pull character in a customized way.

Conclusion 🤩

Glock Lower Parts Kits are a great way to improve the function and performance of your Glock pistol. They offer a range of advantages, including improved trigger control, customization options, a competitive edge, consistency, reduced recoil, enhanced ergonomics, cost-effective upgrades, improved reset, aesthetics, and ease of installation.  In this article, we’ve reviewed some of the best Glock LPKs on the market and given you some tips on how to choose the right one for your needs.

We hope that the buyer’s guide has helped you learn more about Glock LPKs and feel confident in making a purchase.


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3 months ago

 Hey everyone, I recently got a Glock lower parts kit, and I’m having some issues with poor fit and tolerance. It seems like some parts aren’t aligning properly. Has anyone else encountered this problem?

    3 months ago
    Reply to  Harvey

    🟪 The first thing I’d recommend is to double-check if all the components in your lower parts kit are compatible with your specific Glock model. Sometimes, minor differences between Glock generations or revisions can lead to fit problems.

    🟪 If you’ve confirmed that the parts should be compatible, you might want to inspect the components closely. Look for any visible burrs, rough edges, or imperfections that could be causing interference. Sometimes, a little careful filing or polishing can help improve the fit.

    🟪 However, if you’re not comfortable with DIY fixes or the issues persist, I’d strongly advise reaching out to the manufacturer or the seller of the kit. They might be able to provide guidance or even replacement parts if the kit has manufacturing defects.

    🟪 Lastly, if all else fails and you want to ensure the proper fit and function of your Glock, consider consulting a local gunsmith. They have the expertise and tools to diagnose and address fit and tolerance issues safely.

      3 months ago
      Reply to  Harvey

      I had a similar problem with a third-party lower parts kit once. It turned out that the quality of the kit was subpar, and the tolerances were way off. I ended up switching to a Glock OEM kit, and the difference was night and day. No more fit issues.

        3 months ago
        Reply to  Harvey

         I’ve found that sometimes a bit of careful filing or polishing can help alleviate fit issues with certain parts. Just be cautious not to overdo it and compromise safety. If you’re not comfortable with that, seek the help of a qualified gunsmith.

          3 months ago

          Hi! What tools do I need to install the lower parts kit?

            3 months ago
            Reply to  Scavo

            💠 Glock disassembly tool – This is a must to properly disassemble and reassemble the Glock slide and depress the extractor plunger when removing parts.
            💠 Small hammer – A light hammer allows you to tap out frame pins during disassembly. Use care not to damage parts.
            💠 Punch set – Pin punches in varying sizes help drive out frame pins and install new ones.
            💠 Needle nose pliers – Helpful for manipulating springs and pins during installation.
            💠 Nylon/brass hammer – Softer than a steel hammer, less chance of marring parts during installation.
            💠 Hex wrench – For tightening screws on some magazine releases and slide lock levers.
            💠 Utility knife – Useful for cutting away any polymer flashing on new frame parts.
            💠 Roll pin holders – Makes starting roll pins much easier when installing.
            💠 Lubricant/grease – Prevents galling on the slide rails and barrel lug during reassembly.
            💠 Snap caps – Confirm function after installation by dry firing with snap caps.
            💠 Small screwdriver – For adjusting overtravel stop on some adjustable triggers.
            💠 Armorer’s block – A vise block that securely holds the Glock frame to work on.
            💠 Cleaning supplies – Solvent, brush, rag to remove debris after installation.

              3 months ago

              I’ve been running a Glock OEM lower parts kit, and honestly, it’s been solid. No frills, but it gets the job done reliably. If you’re not looking for any fancy upgrades, it’s a good choice.

                3 months ago

                Hello!  Can I alter the trigger pull weight with the lower parts kit?

                  3 months ago
                  Reply to  Nathaniel

                  ✅ Yes, you can alter the trigger pull weight with a lower parts kit. The lower parts kit contains the trigger, hammer, and other components that control the trigger pull. Changing these components can affect the weight and feel of the trigger pull.

                  🔷 One common way to reduce the trigger pull weight is to install a lighter trigger spring. This will make the trigger easier to pull. However, it is important to note that reducing the trigger pull weight can also make the trigger more sensitive, which could increase the risk of an accidental discharge.

                  🔷 Another way to reduce the trigger pull weight is to install a different trigger altogether. There are many different types of triggers available, and some are designed to have a lighter pull weight than others. However, it is important to note that not all triggers are compatible with all lower receivers.