This SIG MPX magwell was designed to meet the needs of comeptition shooters by enlarging the magwell opening where the factory didn't to ensure clean, fast reloads. The open front design allows you to grab the magazine without fear of pinching your fingers on the reload or having a load that is not completely seated. It works great with 10, 20 and 30 round MPX magazines. Machined from USA produced aluminum in our Redmond, OR factory, it is attached with a friction fit on the larger opening magwells and includes a set screw for the undersized magwell that make installation a breeze. Black 1.565oz

Spring Precision Sig P320 9/40 extended base pads are CNC machined from aluminum and hard anodized. This lengthens the magazine .25" to make for easier, more reliable magazine changes. They also allow you to use a magwell without adding capacity to the magazines. They are perfect for IDPA ESP and USPSA. Blue. 0.80 OZ Round hole.

These pads use the old style round nipple-style locking floorplate. Newer generation magazines have a square-style locking floortab/basepad. If you have this style, you need SP0211B, square hole type.

This basepad is designed by shooters for shooters for the SIG MPX magzine and can add up to 10 rounds in 9mm. These are made from high quality aluminum and hard anodized to provide an ultra durable platform to support the MPX magazines. Our extentions are easy to remove and clean. Whether it is for duty use, competition, or recreation, this is a great addition to your MPX. For use with the 20 and 30rd mags only. Blue 2.856oz

We now offer an extra power magazine spring for the MPX extensions. It is not necessary for normal feeding and functioning, however, it may be necessary for slide lock functionality after last shot fired.

***DO NOT USE THE BOTTOM PLATE ON YOUR MAGAZINE SPRING.***