ProMag Extended Polymer Magazine - 22 Rounds, Fits Glock 21 / 30 .45 ACP Handguns, High-Impact Injection-Molded Polymer, Heat-Treated Chrome Silicon Spring, Black Finish - GLK-A17 / 708279014758
Product Description
Boosting the fire capacity of your big-bore .45 ACP Glock pistol, setting up a high-volume PCC carbine platform, or staging an extended range-day feed system requires a high-capacity magazine built to reliable feed geometry. Factory standard 13-round magazines limit your total continuous fire strings, forcing frequent magazine swaps that disrupt your target tracking rhythm on your bench. The **ProMag® Extended 22-Round .45 ACP Magazine for Glock 21/30 (GLK-A17 / 708279014758)** flatlines these capacity bottlenecks, delivering an extended **22-round fire payload** wrapped inside an impact-resistant polymer housing.
Proudly engineered and manufactured in the United States by ProMag Industries, the GLK-A17 is molded from proprietary **high-impact glass-filled black polymer** designed to withstand heavy recoil shock and rough range drops. The internal feed mechanics feature a heat-treated **chrome silicon wire spring** paired with an injection-molded polymer follower to ensure constant upward pressure and smooth round presentation into the chamber. Functioning seamlessly across Gen 1 through Gen 4 Glock 21, 21SF, 30, 30S, and 30SF handguns (as well as .45 ACP AR-style carbines accepting Glock 21 magazines), this turn-key extended magazine maximizes your firepower potential straight from your armorer bench.
Engineered to slide cleanly into standard .45 ACP Glock magwells and PCC receiver wells, this factory-calibrated extended magazine ensures reliable feeding directly from your workspace bench.
*Armorer Bench Notes & Real-World High-Capacity Staging Guidance: The ProMag GLK-A17 extended magazine arrives workspace ready as a pre-assembled 22-round feed unit featuring an injection-molded polymer body, baseplate, follower, and internal chrome-silicon spring. UNIVERSAL GLOCK .45 ACP HANDGUN INTERFACE MATRIX: This extended magazine is engineered natively, strictly, and dimensionally to fit **Glock 21, 21SF, 30, 30S, 30SF, 41 handguns (Gen 1 to Gen 4), and .45 ACP PCC carbines taking G21 magazines**. *Gen 5 Catch Cut Notice:* This magazine features standard left-side catch cutouts; if you have reversed your magazine catch for left-handed operation on a Gen 4 or Gen 5 frame, verify side latch engagement on your bench prior to loading. Armorer Workbench Custom Staging Sequence: 1. Visually and physically confirm your host firearm is completely clear of live ammunition, the chamber is safe and empty, and the safety is engaged. 2. Inspect the feed lips and top follower of the ProMag GLK-A17 to ensure no transit debris or flash molding impedes movement. 3. Load .45 ACP cartridges into the double-stack body, taking care to seat each round fully back against the rear spine. 4. For best long-term spring life during storage, stage the magazine 1 to 2 rounds below maximum capacity (20 to 21 rounds). 5. Insert the loaded extended magazine firmly into the magwell until the side catch clicks loudly into locked engagement. 6. Cycle the slide manually or press the slide release to chamber a round and verify smooth feed ramp transition before rolling downrange.*
Key Features
- Extended 22-Round High-Capacity Payload: Expands your total .45 ACP continuous firepower to 22 rounds, making it ideal for range training, tactical drills, and PCC platforms.
- High-Impact Glass-Filled Polymer Body: Molded from proprietary impact-resistant black polymer to withstand environmental stress, drop impacts, and heavy recoil.
- Heat-Treated Chrome Silicon Spring: Outfitted with a fatigue-resistant chrome silicon wire spring that maintains tension over long-term storage and repeated loading cycles.
- Precision-Molded Polymer Follower: Features a smooth-gliding injection-molded follower designed to eliminate tilt and ensure consistent feed alignment into the chamber.
- Multi-Model Glock .45 ACP Compatibility: Fits full-size Glock 21 and sub-compact Glock 30 frames, as well as .45 ACP pistol-caliber carbines utilizing G21 magazine wells.
- Removable Polymer Baseplate: Designed with a standard removable floorplate to permit fast disassembly for cleaning, spring maintenance, or inspection.
Product Specifications
- Brand: ProMag Industries® (Phoenix, AZ / Made in the USA)
- Model Line: High-Capacity Extended Polymer Pistol Magazine Series
- MPN/SKU Code: GLK-A17 (Glock 21/30 .45 ACP 22-Round Polymer Black Magazine)
- UPC Code Profile: 708279014758
- Caliber Action Standardization: .45 ACP (Automatic Colt Pistol) Centerfire Cartridge
- Magazine Capacity Floor: 22 Rounds Total Payload Capacity
- Host Firearm Compatibility: Glock 21, 21SF, 30, 30S, 30SF, 41 (Gen 1-4) & .45 ACP Glock-Pattern PCCs
- Structural Material Base: High-Impact Injection-Molded Glass-Filled Proprietary Polymer
- Internal Spring Component: Heavy-Duty Heat-Treated Chrome Silicon Steel Wire
- Follower Component: High-Traction Injection-Molded Black Polymer Anti-Tilt Follower
- Exterior Finish Dressing: Matte Black Non-Reflective Textured Polymer Shell
- Full Kit Component Checklist: 1x ProMag GLK-A17 22-Round .45 ACP Magazine Complete
- Packaging Format Class: Factory Original Sealed ProMag Branded Heavy Poly Hang-Card Blister Pack
- Product Type Category: Handgun Accessories / Extended High-Capacity Magazines
- Overall Physical Length: ~9.75 Inches (~247.6 mm Extended Staging Length)
- Net Component Weight: ~5.20 Ounces (~147.4 Grams Unloaded Metal/Polymer Mass)
- Global Quality Certifications: Built strictly to US Commercial and Target Shooting Quality Standards
- Warranty Tracking Protection: Fully Backed by ProMag Factory Lifetime Limited Warranty
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