Shield Arms DS20 9mm 20 Round Magazine Fits Glock 17 Black Nitride DS20 NC UPC 810159261821
Product Description
The Shield Arms® DS20 20-Round Steel 9mm Magazine (SKU: DS20-NC / UPC: 810159261821) delivers a significant tactical capacity upgrade for full-size Glock® service pistols, packing 20 rounds of 9x19mm Parabellum into a profile that barely extends beyond a factory 17-round magazine. Designed and manufactured in Bigfork, Montana, the DS20 expands your baseline firearm readiness by +3 rounds without the cumbersome bulk, weight, or snag hazards of oversized aftermarket extensions. Engineered specifically for duty, defensive carry, and competitive shooting, it sets the standard for flush-profile, ultra-reliable double-stack capacity.
Constructed from precision-stamped carbon steel heat-treated to RHC 45–50, the DS20 eliminates the thick polymer overmolding of OEM magazines, freeing up internal volume to accommodate 20 rounds in virtually the same exterior footprint. The entire magazine housing is treated with a rugged black nitrocarburize finish, providing exceptional surface hardness, continuous lubricity, and superior resistance to rust, saltwater corrosion, abrasive dirt, and aggressive cleaning chemicals. The internal column utilizes a specialized low-friction polymer anti-tilt follower and an engineered high-tensile spring that delivers continuous, balanced upward pressure across all 20 rounds to eliminate nose-dive malfunctions during high-speed cycling.
Every mechanical tolerance of the DS20 is optimized for hard-use combat and high-round-count range drills. Unlike many generic aftermarket magazines, the DS20 features an integral over-insertion stop stamped directly into the steel sidewalls, preventing over-travel into the reciprocating assembly during high-force speed reloads. The removable impact-modified polymer baseplate allows effortless field-stripping for armorer cleaning and maintenance, while maintaining full mechanical compatibility with Shield Arms DS-Series magazine extensions for shooters requiring maximum competitive capacity.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Fits Glock 17, 34, 45, 47, and 19X (Gen 3 through Gen 6), and seats reliably in Glock 19 frames with base extension below the grip frame. CRITICAL ARMORER NOTICE: The DS20 features a hardened steel body that will prematurely abrade and destroy the factory Glock OEM polymer magazine release catch over time. Installation of a Shield Arms hardened steel magazine catch (Gen 3 or Gen 4/5/6 specific) is strictly required to ensure proper lockup, prevent uncommanded magazine drop, and secure lifetime operational dependability.
- Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty before beginning any bench work.
- Field strip the pistol slide from the frame and utilize an armorer punch to unseat the magazine catch spring, removing the factory polymer magazine catch from the magazine well.
- Install a Shield Arms hardened steel magazine catch matched to your frame generation, reseating the factory catch spring firmly into the steel catch retaining groove.
- Reassemble the host firearm, hand-cycle the slide to verify mechanical clearance, and fully load the DS20 magazine with 20 rounds of factory-spec 9x19mm ammunition.
- Insert the loaded DS20 magazine firmly into the magwell to verify positive click-engagement against the stamped over-insertion stop, followed by cycling dummy test rounds to confirm feed geometry and lockback on an empty follower.
Key Features
- +3 Round Capacity Advantage: Delivers 20 rounds of 9mm Luger in the standard Glock 17 envelope, surpassing OEM 17-round capacity with virtually no added grip length.
- Heat-Treated Steel Construction: Stamped from high-grade carbon steel and hardened to RHC 45–50 for uncompromising feed lip geometry and field durability.
- Black Nitrocarburize Finish: Ultra-hard, corrosion-resistant surface treatment minimizes internal/external friction and withstands harsh duty environments.
- Integrated Over-Insertion Stop: Heavy-duty stamped body stop prevents magazine over-travel and eliminates internal impact against the ejector or slide assembly.
- Anti-Tilt Follower Geometry: Self-lubricating polymer follower guarantees uniform cartridge presentation from the first round to slide lock.
- Field-Serviceable Baseplate: Easy-access polymer floorplate enables fast cleaning and pairs seamlessly with Shield Arms DS-Series extensions.
- American Made & Lifetime Warranty: Designed and produced in Montana, backed by the Shield Arms 100% Lifetime Warranty.
Product Specifications
- Brand: Shield Arms®
- Model/Series: DS20 (DS-Series)
- MPN / SKU: DS20-NC / DS20NC
- UPC: 810159261821
- Caliber: 9x19mm Parabellum / 9mm Luger
- Capacity: 20 Rounds
- Body Material: Stamped Carbon Steel (Heat-Treated RHC 45–50)
- Surface Finish: Black Nitrocarburize (QPQ Nitride)
- Follower: High-Lubricity Polymer Anti-Tilt Follower
- Baseplate Material: Impact-Resistant Polymer
- Platform Compatibility: Glock 17, 34, 45, 47, 19X (Gen 3, 4, 5, 6); Glock 19 (Extended Fit)
- Mag Catch Requirement: Hardened Steel Mag Catch Required (Shield Arms Recommended)
- Country of Origin: United States
