This magazine extension is explicitly made for the Sig Sauer P320 21-round magazines to fit the USPSA 141.25mm magazine gauge.
You have three options for follower and spring:
You have two options for magazine extension length and fit:
Our extension is machined from 6061-T6 aluminum and anodized. We offer them in black, red, blue and silver. When used with the factory follower and spring, the factory locking plate must be removed and not used. We use a spring-loaded detent to secure it to the magazine. It makes it super easy to take it on / off for magazine cleaning, and it is 100% secured. The detent is made from stainless steel and finished in Black Nitride for long life.
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