Underworld Arms

2011 +3 Mag Extension Mk1

$34.99

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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 extension features three deep v groove serrations for 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.

Material Base: 6061-T6

Material Insert: 7075-T6

Weight: 1oz

Length Overall: .825"

The extentiones ran good no malfunctions

The extentiones ran good no malfunctions, I was ifi since i reused the same spring for the mags but i ran them all day and I didnt have any iasues great product :)

Magazine extensions great for C2.

I prefer the C2 grip on my 2011's and these baseplates are great for using more rounds and still being protected from over insertion. I found out that these extensions will not seat if using the machinewerks magwells. I switched to the TTI magwells and they work great now. I also noticed that the follower would bind and not go up all the time with the stock C2 mag spring. I switched to the 17 round(126mm) springs and they work great.