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The 4mm extension represents TTI's approach to mid-profile base pads for modern 2011-style magazines. This gold-finished extension increases standard 20-round magazine capacity to 22 rounds using factory spring and follower components, making it compatible with the USPSA 140mm gauge specification that governs competition divisions.
While it works across all 2011 style magazines, the 4mm extension is specifically engineered for 140mm tube length magazines found in Staccato, Springfield Prodigy, Atlas, and Infinity platforms. The sizing gives you that extra capacity bump where most 2011 competitors want it, without requiring spring or follower upgrades if you don't want them. It maintains the tight magwell fit standard for quality builds.
Machined from billet aluminum and hard anodized to a gold finish, this base pad handles the rigors of match day and the range. The push-pin design lets you swap it on and off with nothing but your hands, making magazine maintenance and cleaning quick work between stages. There's no fiddling with tools or small parts to lose. Field stripping your magazines takes seconds.
If you want to push capacity further, pairing the 4mm extension with TTI's competition spring and follower kits lets you add a 23rd round to compatible magazines, though you'll sacrifice last-round slide lock when loaded to that level. Most competitors find the 22-round setup with factory internals strikes the right balance between simplicity and capability.
Yes, the 4mm TTI extension is specifically designed for Staccato 2011-style magazines. It works with 140mm tubes and adds two rounds to bring capacity from 20 to 22 rounds using the factory spring and follower. It fits Staccato compact and full-size configurations, though compatibility depends on your specific magazine generation and tube length.
Yes, the 4mm extension achieves its +2 capacity using factory Staccato springs and followers without modification. You don't need aftermarket components unless you want to push capacity even higher to 23 rounds, which requires TTI competition parts and prevents last-round slide lock.
The 4mm extension with factory internals fits within the USPSA 140mm gauge specification, making it legal for Limited and Carry Optics divisions. When measured with the extension installed, your loaded magazine stays within the 140mm maximum length requirement.
Installation is straightforward with the patented push-pin design. Push the pin down, slide the extension onto the magazine tube, then push the pin up to lock it. No tools needed. Removal works the same way in reverse, making magazine cleaning and maintenance quick field work.
| UPC | 810003108685 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | STVB-4G09 |
| Color | Gold |
| Product Type | Magazine Extension |
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