'does it scrw in to the shell or is a snap':
-It screws in using three screws. One on each side of the helmet, roughly where your temples are, and one tucked under the visor in the center of the helmet. The visor has a piece attached under it the width of a screw, but about an inch long, that the screw goes through, allowing you to adjust the visor up and down on the helmet.
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Formerly SwitchPollard
'Thanks for ripping off my friend. He has a magnum.' - SkogenJake