Not clear to me if you mean the first round fed from the mag, or the first round after the first round fired...
regardless, if there is no real "jam" then the recoil spring or main spring could be the culprit. ...but before I change it, I would make sure the gun is real clean and properly lubricated...
If the new mag is the only one you have, I would try others too... it may be that the one you have is just not a good mate to the gun.
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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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