Description Glock 31, 357 Sig, 10rd Magazine Say hello to the Glock G31 10rd 357 Sig Black Polymer Magazine. 10-round capacity? Got it. 357 Sig caliber? Check. Black polymer construction? Absolutely. This is your go-to mag for your Glock 31. Solid and dependable – just what you need. Perfect fit. Tailored to suit your Glock 31. Fast reloads. More trigger time, less downtime. Reliable. Built to withstand harsh conditions. Upgrade your Glock 31 with the Glock G31 10rd 357 Sig Black Polymer Magazine. Step up your shooting game. HIGH CAP MAGAZINES STATES WITH APPLIED MAGAZINE RESTRICTIONS New York, New Jersey, Hawaii – NO MAGAZINES Washington – No magazines greater than 10 rounds Oregon – No magazines greater than 10 rounds California — No magazines greater than 10 rounds Colorado — No magazines greater than 15 rounds Boulder, CO — No magazines greater than 10 rounds Connecticut — 10 Rounds and less with a valid permit. Illinois — No magazines greater than 10 rounds Maryland — No magazines greater than 10 rounds Massachusetts — No magazines greater than 10 rounds Vermont — No magazines over 10 rounds for long guns. No pistol magazines over 15 rounds Washington D.C. — No magazines greater than 10 rounds Please be aware of your local firearms laws, as this may not be a complete list.