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I recently correctly shimmed the gas lock on my Socom16 and got about a 6" POI shift (up, at about 50M.) Has anyone else experienced this? Just curious.
 

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Poi

Anything done to any part attached to the barrel will result in a POI change.
 

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When I unitized and shimmed mine the POI shifted about 3 inches higher and to the right. The good thing is the groups went from 3" to 1" so I guess it works.
 

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+1 Ted Brown, anytime I have made any modification to the barrel or gas system the POI changed.
 

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Mine exhibited a change of only one inch high. Luckily it was in the same measure as the rear sight click adjustments. It would have upset me if it was,.. say...1 1/2 ".......a half inch off is unacceptable for me, and I quit using Kentucky windage as a youngster.
 
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