Check Mate Industries 2011 140mm 18 Round Magazine 10mm Auto 40 S&W Polished Stainless Steel CM102011140S UPC 850020492855
Product Description
The Check-Mate Industries® 18-Round 140mm Double-Stack Magazine (SKU: CM102011140S / UPC: 850020492855) sets the benchmark for feeding reliability, structural endurance, and match-grade consistency in 10mm Auto and .40 S&W double-stack 1911 platforms. Engineered by one of the United States military's and top-tier OEM firearms manufacturers' primary magazine providers, this magazine solves the historic feeding vulnerabilities of high-recoil, straight-walled big-bore cartridges in modern 2011-pattern handguns. Whether running high-pressure 10mm defensive loads through backcountry sidearms or major-power-factor .40 S&W in USPSA competition, the CM102011140S delivers continuous round presentation and instantaneous slide-lock engagement.
Every magazine tube is precision-formed from premium American-milled stainless steel and through-hardened rather than merely case-hardened, ensuring the feed lips resist deformation under heavy cyclic shock and repeated drops onto hard pack. Check-Mate utilizes an extensive multi-stage internal and external polishing process that strips away microscopic tool marks and carbon-adhering roughness. This micro-polished finish drastically lowers cartridge friction, prevents case-wall binding across full 18-round stacks, and guarantees clean, slick drop-free operation even in dusty tactical or competition environments.
Internally, this magazine integrates Check-Mate's advanced self-lubricating, anti-friction polymer follower, sculpted with cartridge-specific geometry to prevent nose-diving across truncated-cone, wide-meplat flat point, and jacketed hollow-point projectiles. Backed by a high-endurance precision-wound music wire spring, feeding force remains balanced and linear from full compression down to the final cartridge. The standardized 140mm tube profile is finished with a removable impact-resistant polymer basepad and retaining floorplate, facilitating rapid field stripping, carbon scrub-down, and routine armorer maintenance.
*Armorer Bench Notes & Real-World Staging Guidance:*
Fitment Matrix: Direct fit for Staccato 2011, Springfield Armory 1911 DS Prodigy, Kimber 2K11 / 1911 DS, and EAA Girsan Witness 2311 chambered in 10mm Auto or .40 S&W. CRITICAL: Not for single-stack 1911s or wide-body frames requiring dedicated proprietary non-Staccato tubes (such as Para P-series). Never lubricate magazine interiors with wet oils, grease, or aerosol solvents, as this attracts unburnt propellant grains and induces follower drag; use only dry-film silicone or maintain a clean, dry stainless surface.
- Ensure the host firearm is completely clear, magazine removed, and chamber visually and physically verified empty.
- Inspect feed lips for clean symmetry and verify the polymer follower transitions smoothly against the slide stop engagement shelf without binding.
- Depress the bottom floorplate retaining pin and slide the polymer basepad forward off the retaining rails to verify spring tension and clean orientation of the spring coils against the follower.
- Slide the floorplate back into full detent lock, verify the basepad is securely seated, and load the magazine to capacity using a magazine loading tool to settle the column geometry.
- Insert the magazine into the empty pistol frame to verify positive latching into the magazine catch, free-fall drop when released, and correct slide stop lockback engagement when the slide is racked rearward.
Key Features
- Through-Hardened Stainless Construction: American-milled stainless steel body hardened through its core to permanently resist feed lip spreading and frame wear.
- Micro-Polished Interior & Exterior: Mirror-polished body minimizes ammunition friction, prevents case-wall binding, and ensures rapid drop-free ejection.
- Self-Lubricating Polymer Follower: Purpose-contoured anti-friction follower geometry stabilizes wide-meplat 10mm and .40 S&W rounds to eliminate nose-dive malfunctions.
- High-Tensile Music Wire Spring: Precision-calibrated spring wire delivers consistent upward pressure over thousands of loading cycles for unwavering feeding and lockback.
- USPSA 140mm Standard Form Factor: Meets competition 140mm gauge specifications while providing a duty-ready 18-round capacity.
- Impact-Resistant Removable Basepad: Heavy-duty polymer floorplate design cushions drops onto hard surfaces and disassembles without specialized tooling.
Product Specifications
- Brand: Check-Mate Industries®
- Model/Series: 2011 / Double-Stack 1911 140mm Magazine
- MPN / SKU: CM102011140S / CM40-2011-140-S
- UPC: 850020492855
- Caliber: 10mm Auto / .40 S&W
- Capacity: 18 Rounds
- Tube Length: 140mm
- Body Material: American-Milled Through-Hardened Stainless Steel
- Follower: Self-Lubricating Anti-Friction Polymer
- Basepad: Removable Polymer with Retention Plate
- Platform Compatibility: Staccato 2011, Springfield Prodigy, Kimber 2K11, EAA Witness 2311, Standard 2011 Staccato-Pattern Frames
- Country of Origin: United States
