- Comes with spring
- Adds 20 more rounds
- Designed for fast, easy cleaning
- Allows for bolt hold open
- Made of delrin
- Machined in house
SIG MPX Mag Extension 9mm +20
We’ve designed this mag extension for the SIG MPX with you in mind. Running this in a match will let you clean the mags with ease and give you 50 rounds total per mag!* You won’t need to make any modifications to the follower as well. If you’re thinking of doing some upgrades on your SIG MPX for competition, this a great place to start!
*Mag is designed to be used with SIG MPX 30 round magazines.
*Does not come with magazine
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