The 4mm is TTI's mid profile extension for the Staccato/Infinity/Springfield Prodigy/Atlas/Infinity 9/38 2011 style magazine. Although it will work on all 2011 style magazines, it is recommended for the 140mm magazine. It brings the capacity up from 20 rounds to 22 rounds with the factory spring and follower and still fits the USPSA 140mm gauge.
- Recommended for the 140mm 2011 Magazine
- +2 Round Capacity with Factory Spring and Follower
- Fits the USPSA 140mm Gauge
State & Local Restrictions — Order Reviewed Before It Ships
Some firearms, magazines, and accessories are restricted or prohibited in certain states, cities, and counties, and these laws change often. Each order is manually reviewed against the current laws for your shipping address before it ships. If we can't lawfully ship this item to your location, we'll contact you to cancel or adjust your order and issue a refund. You're responsible for knowing and following the laws where you live — if you're unsure, please check or ask us before ordering.
