I also thought at first that it might be flinching but what if the design of the gun is not right for the OP? Maybe his hand is too small to fit the thicker grip or something. Maybe he should consider a thinner pistol to carry in the same caliber. I've seen a lot of shooting problems and small hands trying to grip some thicker Glock pistols is one of them. Just a thought to consider as a second idea.
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