Glock 20 Gen 4 OEM Frame

Upgrade or rebuild your Glock 20 with a factory-spec Glock 20 Gen 4 OEM Frame — the serialized lower receiver that delivers strength, durability, and consistent performance for the powerful 10mm platform. Replace a worn frame or complete your compatible build with a reliable Gen 4 foundation.

Product Description | Specs for Glock 20 Gen 4 OEM Frame

Glock molds the Glock 20 Gen 4 Frame from its proprietary high-strength polymer blend to handle the increased pressure and recoil of 10mm Auto. The full-size frame provides a solid grip and enhanced control, while the Gen 4 Modular Back Strap System (MBS) lets you customize grip size for a more secure, comfortable fit.

Integrated steel guide rails reinforce high-wear areas and maintain precise slide alignment. The factory geometry accepts a Glock 20 Gen 4 slide assembly and compatible Gen 4 lower parts kit (LPK) without modification.

What’s Included For Complete Glock 20 Gen 4 OEM Frame

A complete OEM Glock 20 Gen 4 frame assembly typically includes:

• Serialized Glock 20 Gen 4 polymer frame
• Glock Gen 4 lower parts kit (LPK), including:
• • Trigger housing with ejector
  • Trigger with trigger bar
  • Connector
  • Slide stop lever
  • Reversible magazine catch (Gen 4 style)
  • Magazine catch spring
  • Locking block
  • Trigger pin, locking block pin, and trigger housing pin
• Interchangeable Gen 4 backstrap panels (varies by supplier)

Suppliers may configure kits differently, so always confirm included components before purchasing.

What’s Included For Stripped OEM Frame (No LPK)

A stripped OEM frame provides:

• Glock 20 Gen 4 serialized polymer frame only
• Pre-molded pin holes and internal structure ready for LPK installation

Stripped frames do not include internal components, pins, locking block, or magazine catch assemblies.

Specifications

• Model: Glock 20 Gen 4 OEM Frame
• Caliber Compatibility: 10mm Auto (with complete slide/barrel assembly)
• Frame Size: Full-Size
• Generation: Gen 4
• Material: High-strength polymer with steel rail inserts
• Finish: Black matte polymer
• Accessory Rail: Integrated Glock accessory rail
• Backstrap System: Modular (Gen 4 MBS)

Installation Overview (General Information)

Have a qualified armorer or gunsmith perform assembly.

Install the Lower Parts Kit

• Verify all components remain unloaded and safe.
• Install the trigger housing and connector.
• Seat the locking block and secure it with proper pins.
• Install the magazine catch and spring.
• Perform a full function check after installation.

Attach the Slide Assembly

• Place the fully assembled Glock 20 Gen 4 slide onto the frame rails.
• Pull the slide fully rearward and release.
• Conduct complete function and safety checks before use.

Always follow official Glock armorer guidelines during assembly.

Safe Storage & Handling

• Store the frame unloaded and separate from ammunition.
• Secure it with a cable or trigger lock.
• Keep it inside a locked firearm safe or secure container.
• Contact a licensed FFL or gunsmith for compliance or permanent modification questions.

Compatibility

• Fits: Glock 20 Gen 4 slide assemblies
• Magazine Compatibility: Glock 20 Gen 4 10mm magazines
• Parts Compatibility: Gen 4 large-frame lower parts kits
• Not Compatible With: Gen 3 or Gen 5 large-frame components unless verified

Confirm generation and large-frame compatibility before installing components.

What Is the Glock 20 Gen 4 OEM Frame Made Of?

Glock manufactures the Glock 20 Gen 4 OEM Frame from an impact-resistant polymer blend that resists wear, absorbs recoil, and reduces overall weight. Steel guide rail inserts strengthen critical contact points and maintain consistent slide-to-frame alignment.

Customization Options

• Backstraps: Swap Gen 4 backstrap panels to adjust grip size
• Controls: Install extended or reversible Gen 4-compatible controls
• Grip Work: Add professional stippling or texture modifications through a qualified gunsmith
• Magazine Enhancements: Use compatible magazine extensions designed for Glock 20 Gen 4 magazines

After any modification, test function safely and confirm reliability before use.

FAQs

Q: Does this frame include internal parts?
Complete configurations include internal components. Stripped frames include only the serialized polymer frame. Always verify before purchase.

Q: Will a Glock 21 slide fit this frame?
No. The Glock 21 uses a different caliber and slide dimensions. It does not directly fit the Glock 20 Gen 4 frame.

Q: Can I use Gen 3 parts in this frame?
Gen 4 frames use updated geometry and a modular backstrap system. Use Gen 4-specific parts unless compatibility has been confirmed.

Q: Is this the serialized firearm component?
Yes. The frame serves as the serialized component and must transfer according to all applicable federal, state, and local laws.

DISCLAIMER

Pistolframes.com provides aftermarket and compatible parts and components for GLOCK pistols. We operate independently and do not represent, endorse, or have any connection with GLOCK, Inc. or GLOCK Ges.m.b.H.

GLOCK, Inc. and GLOCK Ges.m.b.H own the trademark “GLOCK” and other related marks.