Sounds like a case of worn rear sight teeth to me... they aren't deep enough to hold the sight position during the recoil impulse... Just my educated guess... DAMHIK 
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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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