The hold open is activated by the loading button on the magazine follower when it rises to the highest position when the last round is chambered and fired. Compare the buttons on the two magazines that you have to find out why one isn't working properly. If you remove the right grip you can watch the function operate.
It is possible that the older magazine has an oversize button that rubs the inside of the grip and prevents the button from rising high enough to move the hold open. You can test this by test firing the gun without the right grip installed.
If your magazine requires repairs, I recommend you send it to "GT" who will rebuild it to specs with new springs.
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regards, -John S
"...We hold these truths to be self-evident that ALL men are created EQUAL and are endowed by their Creator with certain UNALIENABLE rights, and among these are life, LIBERTY, and the pursuit of happiness..."
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