Add an additional 3 rounds to your 2011 C2/P/XL/XC/MAC/Tisas/Checkmate mags and improve the ergonomics and aesthetics at the same time.
We have designed the most intuitive to install mag extension on the market. It uses no tools, screws, clips, plates, or levers. The installation is identical to a stock base pad, simply remove the stock base pad and plastic retainer, then install our 7075 aluminum retainer and slide the new 6061 extension on. Installation and removal takes seconds and requires no tools. The assembly is rock solid, and the length stays within the 140mm tournament gauge when using a 17rd magazine tube and can also be used on 16rd mags for the C2
The Mk2 extension features a deep finger groove with serrations for a narrower profile and improved ergonomics when loading and stripping. The tool less design gives an incredibly clean look uncluttered by extra parts. We cnc engrave our logo onto the bottom of the retainer rather than the cheaper option of laser etching the anodizing.
We don't make compromises and neither should you, elevate your game with the Underworld Arms Mag Extension.
Specifications
Not compatible with C/CS/Atlas/Prodigy mags
Adding this extension to a 20rd staccato mag may require spring tuning.
Fitment is perfect, I got 100% what I expected. Material and Quality is great.
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Anonymous
Perfect mac9 extention
Works and Looks great. Easy install for 3 more rounds.
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Chris S
Great product
Very easy to install. The mag extension adds just enough weight to an empty mag for mag drops in quick reload situations. The fit and finish is great and the additional length added to the mag is negligible in IWB carry.
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Jason Mckee
Awesome mag extension!!
Awesome mag extension!! Why would you want a cheap 3D printed plastic one when this is available? Very well made! Super pleased with it.
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Anonymous
These are great!
These are great! Super easy to install, awesome product!
