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If you're running a Glock-pattern 9mm AR-15 at the range or in competition, 50 rounds in a single magazine changes the game. You stop fumbling with reloads and start focusing on your groupings or drills. That's the whole idea behind this ProMag drum.
The drum is constructed from DuPont Zytel based polymer to keep the weight down, but don't let that fool you into thinking it's flimsy. The upper tower features a full-length steel internal insert that handles the heavy lifting when it comes to reliable feed geometry. ProMag engineered this specifically for the Glock-pattern magazine well, so it fits flush and won't rattle around in your platform. The injection molded follower and heat-treated stainless steel spring work together to feed round after round without binding.
ProMag has been making firearms accessories in the USA for a long time, and it shows in how they construct this drum. Each magazine goes through multiple assembly checks to maintain consistent quality. The combination of polymer body with steel reinforcement keeps overall weight reasonable, which matters when you're shouldering a rifle for extended shooting sessions. You won't feel beat up at the end of the day like you would with a heavier metal alternative.
Fifty rounds means you can run entire drill strings without stopping to reload. In competition, that translates to cleaner stage runs with fewer interruptions. At the range, it just means more shooting and less downtime. The flush-fit design maintains your rifle's profile and handling characteristics, so you're not fighting the magazine. It loads through the standard tower method, which gives you tactile feedback as you load.
ProMag backs this magazine with a lifetime guarantee against manufacturer defects. Made in the USA.
No, this drum is designed specifically for 9mm AR-15 carbines that accept Glock-pattern magazines, not Glock pistols themselves. The magazine tower is engineered for AR-15 magwell fitment. If you need a drum for a Glock handgun, ProMag makes a separate pistol-specific model.
Modern drums like this one use multiple assembly checks during manufacturing for consistent quality. Keep it clean and load it properly without overfilling beyond 50 rounds, and it feeds reliably. The steel internal insert in the tower handles feed geometry, and the stainless spring resists binding.
You'll feel spring resistance build up as you load, more than with a standard box magazine. Loading through the tower takes a bit more effort as you get toward capacity, but it's straightforward. Some people find it worth the effort for 50 rounds without a reload. Take your time and you won't have issues.
The polymer construction with steel reinforcement keeps the weight reasonable compared to all-metal drums. A loaded 50-round magazine adds noticeable weight to your setup compared to a standard stick magazine, but it won't fatigue you over a range session.
| UPC | 708279014390 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | DRMA12 |
| Caliber/Gauge | 9mm |
| Capacity | 50rd |
| Color | Black |
| Length | 14.6500 |
| Model | |
| Model Fit | AR-15 with Glock Style Mag |
| Product Type | Magazine |
| Shipping Weight | 1.65 |
| State Restriction (CA) | NO DIRECT SHIP TO CALIFORNIA |
| State Restriction (IL) | NO SALE TO ILLINOIS PICA |
| State Restriction (OR) | NO SALE TO OREGON |
| State Restriction (RI) | NO DIRECT SHIP TO RHODE ISLAND |
| State Restriction (WA) | NO DIRECT SHIP TO WASHINGTON |
| Quantity | 1 |
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