Promag .40 S&W (50) RD Druim Fits Glock 22/23 Black Polymer DRM-A19
Features and Specifications:
This is not a Glock Factory Part, it is an after market part
50-round drum magazine
Fits the Glock Model 22/23 .40 S&W pistols
Drum housing constructed of a proprietary DuPont Zytel based polymer
Magazine upper tower has full length steel internal insert stamped and welded like the factory magazine
Injection molded magazine follower
Magazine spring formed from heat treated stainless steel
Made in U.S.A.
No Ratings
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Can this fit Glock gen4 31 sig 357
Answer:
Hello again Bam! I'm aware that 40 S&W mags can run 357 SIG ammo (but not the other way around). That said, I can only recommend this mag for the handguns it was specifically designed for: G22, G33, and G27. (That's not to say it won't work in your G31. I'm just not at liberty to recommend this product for a pistol it isn't specifically intended for.)