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TTI's 4mm extension sits right in the sweet spot for competitive 2011 shooters looking to squeeze out extra capacity without overshooting gauge limits. Designed specifically as a mid-profile pad, it boosts your 140mm magazine from 20 rounds to 22 rounds while staying compliant with the USPSA 140mm gauge. That's the kind of practical advantage that makes a difference between stages without requiring any special modifications to your magazine internals.
The beauty of this extension is that it works with your existing factory spring and follower, so there's no need to source additional components or worry about compatibility headaches. If you want even more capacity, you can swap in TTI's competition thin follower and 11-coil spring to reach 23 rounds, though the slide won't lock back on the last round at that point. The 4mm profile keeps things balanced and lets the pad clear various magwell designs without binding or fitment issues.
Machined from billet aluminum and hard anodized in bright red, this pad is built to handle competition abuse and look sharp doing it. TTI's patented push-pin design makes installation and removal tool-free, so you can swap basepads between magazines or clean them between stages in seconds. The pin locks securely with a visible retaining mechanism, so you know at a glance that the pad is properly seated. No Loctite adjustments needed, no stripping set screws, just slide it on and push the pin up to lock it down.
Yes. The 4mm is specifically designed for 140mm magazines and passes the USPSA 140mm gauge when installed. While it'll work on all 2011 style magazines, it's optimized for 140mm tubes to maximize that fit. Some magazine tubes from different manufacturers or generations may have slight dimensional variations, so minor fitting might be needed in rare cases, but this is uncommon with factory magazines.
No. The 4mm extension works with your existing factory spring and follower, so you don't need to purchase additional components. If you want to bump capacity up to 23 rounds, you'd swap in TTI's competition thin follower and 11-coil spring, but that's optional and separate from the base pad itself.
TTI's push-pin design is incredibly straightforward. You push the retention pin down until it protrudes from the base plate, slide the extension on from the rear of the magazine, then push the pin back up to lock it in place. It's tool-free and takes seconds. The pin set screws come with Loctite applied at the factory tension, so you shouldn't need to adjust them.
No. TTI offers the 3mm as a low-profile option (best for 126mm tubes) and the 7mm as their longest extension. The 4mm is their mid-profile sweet spot, making it the most popular choice for standard 140mm competition setups because it balances capacity gain with gauge compliance and a sleek appearance.
| UPC | 810003108630 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STVB-4G03 |
| Color | RED |
| Product Type | Magazine Extension |
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