My blue laminate 97K had POI shift issues when fitted with the basic Vmach kit (seal spring and guides).
shift was temperature dependant and rate of fire dependant (internal temperature?), about 0.75 mildots.
Also measured about 50ftps power drop.
Cant do more tests as I've just "unturned" it.
Last edited by MTA; 19th June 2015 at 05:29 PM.