GLOCK OEM Recoil Spring Assembly — For Glock 21, Gen 4 | Part No. 30077

Restore factory feel and reliability to your .45 ACP with the GLOCK OEM Recoil Spring Assembly (RSA) for Glock 21 Gen 4, part number 30077. This is the exact, factory-engineered dual recoil spring assembly designed by GLOCK for the Gen 4 G21, delivering the proper spring rate, slide velocity, and return-to-battery timing the pistol was built around. If you’re chasing erratic ejection, sluggish cycling, or simply performing routine maintenance, a genuine GLOCK RSA helps bring your handgun back to box-stock performance.

Why Choose a Genuine GLOCK Recoil Spring Assembly?

• Factory-Specified Performance: Tuned for .45 ACP pressures in the Glock 21 Gen 4, maintaining correct slide speed and lockup for dependable extraction and feeding.

• Dual Spring Design: Gen 4’s nested/dual-spring system reduces felt recoil and helps extend service life compared to single-spring designs.

• Drop-In Fit: No gunsmithing required for compatible models; installs in minutes following standard field strip.

• OEM Durability: Built from GLOCK-spec components to withstand high round counts, temperature swings, and daily carry conditions.

• Consistency & Safety: Returning to factory spec helps preserve point of impact, sight tracking, and striker engagement timing.

Key Features at a Glance

• Compatibility: Glock 21 (Gen 4 only)

• Caliber Platform: .45 ACP

• Type: Dual recoil spring assembly (RSA)

• Part Number: 30077

• Installation: Direct drop-in during standard reassembly

• Use Case: Routine maintenance, troubleshooting cycling issues, returning pistol to OEM spec

Compatibility Note: This RSA is specifically for Gen 4 Glock 21 pistols. It is not intended for Gen 1–3 or Gen 5 models. Always verify your generation before purchase.

When to Replace Your RSA

• Round Count Milestones: Regular replacement intervals help prevent sluggish return-to-battery and erratic ejection patterns.

• Visible Wear or Set: Coil set, kinks, or uneven tension indicate it’s time to swap.

• Performance Symptoms: Stove pipes, premature slide lock, or failure to feed/eject can be spring-related (after verifying ammo/magazine condition).

Simple, Safe Installation (Overview)

1. Unload & Clear: Remove magazine, lock slide open, and visually/physically inspect the chamber.

2. Field Strip: Remove slide assembly per your Glock manual.

3. Swap RSA: Lift out the old RSA, seat the new GLOCK 30077 in the correct notch on the barrel lug.

4. Reassemble & Function Check: Cycle the slide, verify smooth return, and confirm proper slide lock operation with an empty magazine.

Always follow the official Glock owner’s manual and safe handling rules. If unsure, consult a certified armorer.

Benefits You’ll Notice

• Smoother Cycling: Correct spring rate helps your slide track naturally and return on target faster.

• Reliable Lockup: Consistent return-to-battery minimizes out-of-battery conditions and related malfunctions.

• Predictable Ejection: Factory timing aids in consistent ejection patterns, making diagnostics and training easier.

• Recoil Management: Dual-spring system helps tame .45 ACP impulse, improving control shot to shot.

Care & Maintenance Tips

• Keep It Clean: Wipe carbon and debris from the RSA during routine cleaning—do not over-lube.

• Inspect Frequently: Look for coil set, corrosion, or damage after high round-count sessions.

• Use Quality Ammo & Mags: Reliable components complement the RSA’s job and reduce wear.

Ideal For

• Duty & Defensive Pistols: Preserve OEM reliability and timing.

• High-Volume Shooters: Competitive or training-focused owners replacing wear parts proactively.

• Troubleshooting Builds: Baseline your pistol to factory spec before chasing other changes.

What’s in the Box

• GLOCK OEM Recoil Spring Assembly — G21 Gen 4, Part 30077

FAQ

Q: Will this work in a Gen 3 or Gen 5 Glock 21?
A: No. This RSA is specifically designed for Glock 21 Gen 4. Use the correct part for your generation.

Q: Do I need a gunsmith to install it?
A: Typically no. It’s a drop-in part during a standard field strip. If you’re unfamiliar with Glock disassembly, consult the manual or a certified armorer.

Q: How often should I replace my RSA?
A: Intervals vary based on use, ammo, and environment. Many shooters replace recoil assemblies as part of scheduled maintenance after substantial round counts or when performance symptoms appear.

Q: Can a worn RSA cause malfunctions?
A: Yes. A fatigued spring can contribute to failures to feed/eject or inconsistent ejection. Replacing with an OEM RSA often resolves these issues when other variables are sound.

SEO Highlights (For Shoppers)

• GLOCK OEM recoil spring assembly for Glock 21 Gen 4

• Dual spring assembly tuned for .45 ACP

• Factory original part for reliable cycling and consistent lockup

• Easy drop-in installation during field strip

• Part number 30077

Restore factory timing and reliability to your Gen 4 workhorse with the GLOCK OEM Recoil Spring Assembly (30077)—the simplest, most trusted way to keep your Glock 21 running like new.
"The End"