Expert Review Premium p320 upgrade - Tactical Precision Manufacturing TPM Sig P320/X5 Legion 3 Round Extension

This is one of the best mag extensions for the P320 on the market. This extension works on all of the OEM P320 mags I have (15, 17, and 21rd mgs) not sure about 10 rounders. Machining and finish on these is pristine. The extension is built like a tank and adds just the right amount of weight to help balance out the gun. I'll be buying more of these for the rest of my 320 mags as soon as possible.