The Short Answers
- Glock 19 extended magazines typically hold 17, 19, or 20 rounds, but legal capacity varies by state—some allow 17, others restrict to 10.
- Reliability drops slightly with extended mags due to increased spring tension and feed ramp wear, though high-quality brands mitigate this.
- Competitive shooters favor extended mags for speed and capacity, while concealed carriers often stick to standard or +1 mags for discretion.
- Aftermarket extended magazines (e.g., Magpul, Brownells) are cheaper than OEM options but may lack the same build quality or reliability.
Deep Dive: The Full Picture
The Glock 19’s popularity isn’t just about its reliability—it’s about its adaptability. The platform accepts a vast array of aftermarket magazines, but extended versions for the G19 aren’t all created equal. A 17-rounder in California might be legal, but the same mag in New York could be confiscated. The discrepancy stems from the 1994 Dickey Amendment, which banned magazines holding more than 10 rounds for civilian use, though loopholes and state-level variations have kept extended magazines in circulation. Manufacturers like Magpul, Brownells, and Wilson Combat have capitalized on this by producing mags that push the envelope—sometimes literally—with reinforced springs and high-capacity feeds. The trade-off isn’t just legal. Extended Glock 19 magazines introduce physical compromises. Heavier springs increase recoil spring tension, which can accelerate wear on the feed ramp—a common failure point in high-round-count shooting. Some shooters report jams when switching between standard and extended mags, particularly in older G19s with worn rails. Yet, for those who prioritize capacity over longevity, brands like Eagle Industries and Tactical Response offer mags with reinforced followers and extended lips to improve reliability. The choice often comes down to intended use: competition shooters tolerate the trade-offs, while duty or carry shooters may opt for mid-capacity mags (e.g., 16-round) to balance capacity and practicality.The Context You Need
The Glock 19’s magazine well is designed for 15 rounds, but the frame’s dimensions allow for slight modifications. Extended magazines achieve extra capacity through a few key adjustments: longer bodies, reinforced springs, and sometimes thicker followers. The most common configurations are 17-round (legal in many states), 19-round (common in competition), and 20-round (rare, often restricted). The 19-rounder is particularly popular in USPSA, where shooters reload mid-match and need every round possible. Legal ambiguity remains the biggest hurdle. While federal law sets a baseline, state attorneys general have interpreted the Dickey Amendment differently. Some states (like Texas) allow open carry of extended magazines, while others (like New York) enforce strict 10-round limits. Even within legal boundaries, extended magazines can draw scrutiny during traffic stops or background checks. Shooters in high-regulation areas often use stealth mags—extended capacity disguised as standard mags—though these are legally gray in many jurisdictions.The Mechanics
The reliability of Glock 19 extended magazines hinges on three factors: spring tension, follower design, and feed ramp clearance. Higher-capacity mags require stiffer springs to seat rounds properly, which increases friction against the feed lips. Over time, this can lead to feed ramp wear, where the magazine’s lip presses against the slide’s feed ramp, causing misfeeds. Some aftermarket mags address this with extended lips or reinforced steel followers, but these add cost and weight. Testing by shooters and reviewers consistently shows that OEM Glock magazines (even extended versions) outlast aftermarket options. Magpul’s PMAGs, for example, are durable but may not match the precision of a Wilson Combat 19-rounder, which is built for competition use. The choice often depends on budget: OEM mags run $30–$50 each, while high-end aftermarket options can exceed $100. For daily carry, many shooters rotate between two extended mags to distribute wear, while competitors may carry three or four to minimize reloads.Details That Change the Picture
Extended magazines aren’t just about capacity—they’re about ergonomics and draw weight. A 19-rounder can add 2–3 ounces to the pistol’s weight, which may not seem like much until you’re making rapid reloads. Competitive shooters train with heavier mags to build muscle memory, but concealed carriers often avoid anything over 17 rounds to keep the draw smooth. The Magpul PMAG 17-round is a favorite in this category because it fits comfortably in most holsters without excessive bulk. Another consideration is magazine life. A standard 15-round mag might see 50,000+ rounds before failing, but extended mags—especially aftermarket—often degrade faster. The Brownells Enhanced Capacity 17-rounder, for instance, is praised for reliability but may not last as long as a Glock OEM 19-rounder in high-stress shooting. Some shooters report that extended mags fail more frequently when mixed with standard mags, likely due to inconsistent spring tension."Extended magazines are a double-edged sword. They give you the capacity you need for competition or home defense, but they’re also the first thing cops look at during a stop. If you’re carrying a 19-rounder in a state that bans them, you’re not just breaking the law—you’re risking your gun." — Former NYPD Firearms Instructor (anonymous, per request)
| Magazine Type | Key Considerations |
|---|---|
| OEM Glock 17/19-round | Best reliability, but expensive (~$40–$50 each). Often used in competition. |
| Aftermarket 17-round (Magpul, Brownells) | Budget-friendly (~$20–$30), but mixed reviews on longevity. Popular for carry. |
| Competition-grade (Wilson Combat, Eagle Industries) | Reinforced followers, extended lips—ideal for USPSA but costly (~$60–$100). |
| Stealth extended mags | Disguised as 10-rounders; legal in some states but high-risk if discovered. |
| Hybrid mags (e.g., 16-round) | Compromise between capacity and legality—common in restricted states. |
Conclusion
Glock 19 extended magazines fill a critical niche for shooters who need more than 15 rounds, but they come with caveats. Legal risks, reliability trade-offs, and ergonomic challenges mean the choice isn’t straightforward. Competitors prioritize capacity and accept the wear, while carriers weigh discretion against firepower. The best approach depends on your priorities: If you’re shooting matches, a 19-rounder is worth the investment. If you’re carrying concealed, a 17-rounder might be the safest bet—provided it’s legal in your state. The market for these magazines reflects broader trends in firearms culture. As states tighten restrictions, aftermarket manufacturers adapt with hybrid designs, while OEMs focus on durability. For now, extended Glock 19 magazines remain a staple—just one more variable in the ever-evolving landscape of handgun ownership.Comprehensive FAQs
Q: Are Glock 19 extended magazines legal in my state?
A: It depends. Federal law bans magazines over 10 rounds, but states like California allow 17-rounders, while New York enforces the 10-round limit. Check your state’s attorney general rulings or consult a local firearms attorney. Some states (e.g., Texas) permit open carry of extended mags, but concealed carry laws may differ.
Q: Do extended magazines hurt Glock 19 reliability?
A: Yes, but minimally if using high-quality mags. Extended mags increase spring tension, which can accelerate feed ramp wear. OEM Glock magazines and competition-grade aftermarket options (e.g., Wilson Combat) handle this better than budget brands. Rotating mags and avoiding mixed use (standard + extended) helps mitigate issues.
Q: Can I use a 19-round magazine in a Glock 17?
A: No. The Glock 17’s shorter slide and different feed ramp dimensions make it incompatible with G19 extended mags. Always use G19-specific magazines—even standard 15-rounders won’t feed reliably in a G17 with extended mags.
Q: What’s the best extended magazine for concealed carry?
A: A 17-rounder is the most common choice for carry, balancing capacity and legality. Brands like Magpul (PMAG) and Brownells offer reliable options under $30. Avoid anything heavier than 17 rounds unless your state explicitly allows it—extra weight slows reloads and may draw attention.
Q: Are stealth extended magazines worth the risk?
A: Only if you’re certain of their legality in your state. Stealth mags (disguised as 10-rounders) are often misrepresented and can lead to confiscation or charges. If you’re carrying in a high-regulation state, stick to mags that comply with local laws—even if they hold fewer rounds.
Q: How do I clean and maintain extended magazines?
A: Extended magazines require more frequent cleaning due to higher spring tension. Disassemble and lubricate the spring, follower, and body with CLP or Hoppe’s #9. Avoid over-lubricating the follower—excess oil can cause misfeeds. Store mags in a dry place and rotate them to distribute wear evenly.
Q: Can I modify a standard Glock 19 magazine to hold more rounds?
A: No, and it’s illegal. Modifying a magazine to exceed its original capacity violates federal law (18 U.S. Code § 922). Only purchase mags from reputable manufacturers—DIY modifications void warranties and may be confiscated during inspections.
