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Check-Mate Witness 2311 9mm Magazine 20rd

UPC: 850020492688

$58.99

60 in stock

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Description

The Check-Mate Witness 2311 is a premium aftermarket magazine purpose-built for 9mm double-stack 2011 pistols like the EAA Girsan Witness 2311, Staccato 2011, Springfield Prodigy, and Kimber 2K11. With a 20-round capacity in a 140mm body length, you get extended firepower without excessive bulk. This mag is crafted from top-tier American milled stainless steel, through-hardened for exceptional strength and durability that lasts through countless range sessions and competition rounds.

The engineering here focuses on reliability. The entire tube is polished inside and out to minimize drag and ensure smooth operation every time you load and unload. Check-Mate designed the follower using their self-lubricating anti-friction polymer, which keeps rounds feeding consistently without hang-ups. Paired with high-performance springs, this magazine maintains consistent tension across the entire range of motion.

Whether you're running drills at the range, competing in 2011 events, or just want backup magazines for your carry pistol, this mag delivers the performance and fit that serious users expect. Check-Mate backs every magazine with a lifetime factory warranty, and being fully made in the USA, you're supporting domestic manufacturing.

Key Specifications

  • Caliber: 9mm Luger (9×19)
  • Capacity: 20 Rounds
  • Body Length: 140mm
  • Material: American milled stainless steel
  • Tube Finish: Polished stainless (through-hardened)
  • Follower: Self-lubricating anti-friction polymer
  • Spring: High-performance stainless steel
  • Manufacturer: Check-Mate Industries (Made in USA)
  • Compatible Platforms: 2011-style pistols including Witness 2311, Staccato 2011, Springfield Prodigy, Kimber 2K11
  • Manufacturer Part Number: CM9-2011-140-S
  • MPN (EAA): 111003
  • UPC: 850020492688
  • Warranty: Lifetime factory warranty

What’s Included

  • Check-Mate Witness 2311 Magazine (1x 20-round)

Frequently Asked Questions

Will this magazine work in my Staccato 2011 or Springfield Prodigy?

Yes. This Check-Mate magazine is engineered for 2011-style double-stack pistols and fits Staccato, Springfield Prodigy, Kimber 2K11, and other standard 2011 platforms. The 140mm body length and 2011 interface ensure snug, reliable fit.

How does the polished tube improve performance?

Polishing inside and out reduces friction and drag as rounds feed and cycle. This smoothness contributes to faster, more reliable feeding without snagging, especially under rapid fire or when running the mag at full capacity.

What makes the self-lubricating follower different?

Check-Mate's anti-friction polymer follower is engineered to move smoothly without external lubrication. It minimizes resistance between the rounds and tube walls, promoting consistent feeding and reducing wear over time.

Is this magazine suitable for competition use?

Absolutely. The 20-round capacity, reliable feeding, and quality construction make it ideal for 2011 competition formats. Many match shooters run these mags specifically because of their dependability under sustained fire.

What's the warranty coverage?

Check-Mate backs this magazine with a lifetime factory warranty. That covers manufacturing defects and ensures you're protected on your investment for as long as you own it.

Additional information

UPC

850020492688

Manufacturer

Manufacturer Part Number

CM9-2011-140-S

Caliber/Gauge

9mm

Capacity

20-Round

Model

Quantity

1

Shipping Weight

0.25

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