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Discussion Starter #1
Im having POI shift to the left after installing a 4 prong flash hider on my usp40 tac. Is this normal? Is there some proper way to index this?
 

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It happens. By adding the FH you've changed the dynamics of the gun. To my knowledge there is no fix aside from adjusting sights or removing the FH.
 

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Discussion Starter #3
I found that if you index it to look like a cross from the front instead of an x like i first did, it actually shoots dead centre! You will really have to use a rubber o-ring
 
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