Hi guys. I appologize in advance if this topic has been covered but I'm a newbie to the PS90 and this forum. I'm looking to buy a new PS90 and I checked out the rifle (OEM sight model) for the first time the other day. I'm torn whether to get a standard model or one with the tri rail. I've been informed that the tri rail system doesn't come with the factory sighting system; is this true? Next, the top tri rail looks like it is mounted pretty high on the rifle. Are you able to have a good cheek weld to the rifle's stock while shooting or do you have to raise your line of sight up to view an optical device like an EOtech? I appreciate any advice or information you can give me on the subject so I purchase the correct rifle! Thanks much!