One of the little-known facts about Glocks is that the .357 Sig magazine functions in BOTH .357 Sig, AND .40 S&W guns. What you see here is a brand-new, current-production Glock 31 magazine (.357 Sig). It fits/functions/works in the Glock 22, but uses a slightly different follower for max reliability with the .357 round. **Please don't try to purchase this magazine if you live in an area where they are banned (CA, HI, NY, CO, CT. . . ). We'd hate to have to report you to law enforcement. *Due to state department restrictions, this product cannot be shipped internationally.