Strike Industries Extended Magazine Plate (EMP) is designed and tested with the stated capacity using factory OEM magazines. We cannot guarantee after-market magazines' capacity, function, or compatibility.
Often users will report they are unable to achieve capacity as advertised.
The most common cause is that the spring is not seated correctly during installation. If the bottom of the magazine spring is not sitting flat on the bottom of the magazine, the spring will not properly compress as rounds are loaded into the magazine. The result will be a hard stop before total capacity is achieved. For troubleshooting tips, please navigate to the product listing on www.strikeindustries.com. Find the product page, scroll down and click on the Manual/video tap in the product description. We offer installation references and troubleshooting guides.
If you continue to have some issues, please do not hesitate to contact us by clicking the orange help button on our website.