The magazine button does the work of lifting the holdopen. A weak mag spring or a damaged button, dirt or an ill-fitting or swollen right grip, or a worn mag latch notch can all contribute to an intermittent function of the holdopen.
Remove the right grip carefully and you can observe the process manually. If the holdopen will work consistently with the right grip removed, then check for appropriate clearance for the mag button to move... especially with aftermarket grips.
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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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