The Taran Tactical Innovation (TTI) 4mm Base Pad in Black (brand part no. STVB-4G01) is a mid-profile extension for Staccato, Infinity, Springfield Prodigy, and Atlas 2011-style 9/38 magazines, bringing capacity up from 20 rounds to 22 rounds with the factory spring and follower still installed.

Key Specifications

• Adds capacity from 20 rounds to 22 rounds using the factory spring and follower — no new internals needed.
• Built for Staccato, Infinity, Springfield Prodigy, and Atlas 2011-style 9/38 magazines.
• Works across 2011-style magazines generally, though it is recommended specifically for the 140mm magazine.
• Stays within the USPSA 140mm magazine gauge, keeping it competition-legal for divisions that check gauge length.
• Finished in Black.

Frequently Asked Questions

Does this require a new spring or follower? No. It works with the factory spring and follower already in the magazine.

Is it USPSA legal? Yes. It still fits the USPSA 140mm magazine gauge, so it stays within length limits for gauge-checked divisions.

What magazines is it built for? It is built for Staccato, Infinity, Springfield Prodigy, and Atlas 2011-style 9/38 magazines, and is recommended specifically for the 140mm magazine.

Buy the TTI 4mm Base Pad for 2011-Style 9/38 Mags, Black

Order the TTI 4mm Base Pad in Black from our Lubbock, Texas gun shop and pick up two more rounds on your 2011-style 9/38 magazines. See the rest of our magazine accessories lineup for more competition magazine upgrades.